Answers
Answer:
15 million is the correct answer .
Related Questions
In Africa what do most people do to provide for themselves and their families
Answers
A sample of the lava flow within the outcrop has 707 Uranium-235 atoms, and 293 Lead-207 atoms. How old is the lava flow?
Answers
Answer:
The lava flow is approximately 351.925 million years.
Explanation:
We find that atoms of Uranium-235 decays and turns into Lead-207 and that half-life of the former one is [tex]703.8\times 10^{6}[/tex] years. The initial amount of Uranium-235 is the sum of current atoms of Uranium-235 and Lead-207. The decay of isotopes is modelled by the following ordinary differential equation:
[tex]\frac{dn}{dt} = -\frac{n}{\tau}[/tex] (Eq. 1)
Where:
[tex]\frac{dn}{dt}[/tex] - Rate of change of the amount of Uranium-235 atoms, measured in atoms per year.
[tex]n[/tex] - Current amount of Uranium-235 atoms, measured in atoms.
[tex]\tau[/tex] - Time constant, measured in years.
The solution of this differential equation is described below:
[tex]n = n_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (Eq. 2)
Where:
[tex]n_{o}[/tex] - Initial amount of Uranium-235 atoms, measured in atoms.
[tex]t[/tex] - Time, measured in years.
In addition, we can calculate the time constant in terms of the half-life:
[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (Eq. 3)
If we know that [tex]n_{o} = 1000\,atoms[/tex], [tex]n = 707\,atoms[/tex] and [tex]t_{1/2} = 703.8\times 10^{6}\,yr[/tex], then the age of the lava flow is:
From (Eq. 2):
[tex]t = -\tau \cdot \ln \frac{n}{n_{o}}[/tex]
By (Eq. 3);
[tex]\tau = \frac{703.8\times 10^{6}\,yr}{\ln 2}[/tex]
[tex]\tau \approx 1.015\times 10^{9}\,yr[/tex]
[tex]t = -(1.015\times 10^{9})\cdot \ln \frac{707\,atoms}{1000\,atoms}[/tex]
[tex]t \approx 351.925\times 10^{6}\,yr[/tex]
The lava flow is approximately 351.925 million years.
The map below shows the locations of what type of boundary?
a. transform
b. collisional
c. convergent
d. divergent
Answers
Answer:
The red lines on this map show us divergent plate boundaries.
Explanation:
The tectonic plates are in constant movement, and this results in interactions between them. At some places the plates collide, at other places slide past each other, and at some move away from each other. The last ones are the places where there is a divergent plate boundary.
The divergent plate boundaries can occur in the ocean or on land. When they occur in the ocean, they form an underwater mountain range, known as a mid-ocean ridge, which is volcanically highly active. An example of this is the mid-Atlantic ocean ridge. When these boundaries occur on land, they form rifts, where the crust starts to crack, a gap opens up, and gradually widens. An example of this is the Great Rift Valley of Africa.
Answer:
D. divergent
Explanation:
Hope this helps :)
Which letter on the map identifies the Black Sea?
The map shows physical features in and around the
Arabian Peninsula.
Ο Α
Map of the Arabian Peninsula
OB
OC
OD
E
G
D
Answers
Answer:
answer is C
Explanation:
i got it right
Answer: The answer is A is identifies the Black Sea, hope this helps. Brainliest please? :)
Explanation:
NEED NOW
In the 1850s, an international conference accepted the Greenwich meridian, located in London, England, as the standard location of the prime meridian. What was the main effect this decision had on cartography? O A. Maps included a longitude line marked as the prime meridian. B. Maps were based with 0° longitude placed in London, England, rather than based on the nationality of the cartographer. C. Maps included the prime meridian to diminish the effect of distortions of land areas to the far north and south. D. Maps were now centered on the prime meridian at 0° longitude
Answers
Answer:
D.
Explanation:
Its not c, maps didn't necessarily state there was a prime meridian, so i dont think it is a, and I don't think maps were ever based around a nation, they were made to see certain areas not to put their nation in the middle.
Why is "dropping the debt" least likely to occur
Answers
Answer:
whoever you are owing that debt is earning from it, whether it's a person, business, school or even the government they are earning from what you are giving.
Why are renewable energy sources often considered “alternative”
Answers
Answer:
Renewable energy sources are often considered alternative sources because in general, most industrialized countries do not rely on them as their main energy source. Hope this helps!!
Answer:
Renewable energy sources are often considered alternative sources because, in general, most industrialized countries do not rely on them as their main energy source. Instead, they tend to rely on non-renewable sources such as fossil fuels or nuclear power.
Explanation:
Hope this helps :)
Ocean waves contain energy that is transferred to them by_____ moving across the surface
Answers
Answer:
wind
Explanation:
Lesson 6
Damaris Sanchez: Attempt 1
YUCULIVILUPUILLS)
Why do Earth, Mars, and Venus lack any hydrogen and helium in their atmospheres?
Their gravitational pull is too strong.
They spin too quickly on their axes.
Their masses are too large.
Their gravitational pull is too weak.
Answers
Answer:
Their gravitational pull is too weak.
Explanation:
Earth, Mars and Venus are terrestrial planets that used to have hydrogen and helium in their atmospheres. However, these light elements were lost over time as they evaporated. This is primarily due to the planets' having weak gravitational pull when compared to the other bigger planets like Jupiter, Saturn and Uranus and the planets' warmer temperature that results to having a thin atmosphere.
On the other hand, the bigger planets have large masses and are cold enough to prevent both hydrogen and helium molecules from escaping the atmosphere.
Answer:
Their gravitational pull is too weak. Correct!
Explanation:
The terrestrial planets all have low mass, so the gravity they produce is much weaker than the sun or the Jovian planets. The gravity exerted by these planets is too weak to hold hydrogen or helium in the atmosphere.
#pennfoster
This structure is the boundary of the cell that separates everything inside of the cell from everything in the
outside world. But it does so much more—it also enables passage of the necessary molecules into the cell
and allows waste material to exit the cell.]
Answers
Answer:
Plasma membrane
Plasma membraneThe plasma membrane is the border between the interior and exterior of a cell. As such, it controls passage of various molecules—including sugars, amino acids, ions, and water—into and out of the cell.
Where do most immigrants to France come from?
India and Pakistan
Turkey
Eastern Europe
France's former colonies in Africa
Answers
Which information does a gegrapher avoid using when defining regions?
Answers
Answer:
When defining regions, geographers avoid using subjective information in determining boundaries. This includes opinions and perceptual information. So the answer is Subjective information.
Find the measure of the missing angle.
42
a
Answers
So 180-42=138°
That means that a is a 138° angle.
The measure of the missing angle. 42 is a 138 degree angle as the angles is straight.
What is the straight angle?A staright attitude is likewise known as 'flat attitude'. In the picture, OX and OY are the fingers of an attitude. The not unusualplace factor O wherein the rays meet is known as the vertex.
So 180 - 42 = 138 degree.That method that a is a 138 degree attitude.
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where is lovelybunchofcowbutts
Answers
Why don't S shock waves get recorded on seismographs all over the globe after an earthquake?
A. S shock waves fade out as they travel through the earth.
B. All shock waves overlap so much that S waves can't be seen on the seismograph
C. S waves travel in the opposite direction, so they are never recorded.
D. S waves are stopped by the outer core of the earth.
Answers
Answer:
A. S shock waves fade out as they travel through the earth.
Explanation:
Seismic waves lose a great number of their energy when they travel over long distances so after an earthquake, they are not recorded on the seismograph.
S waves don't get recorded on seismographs all over the globe after an earthquake because they fade out as they travel through the earth.
Name 3 mountain ranges found in Latin America.
Answers
Answer:
Andes, Sierra Nevada de Santa Marta and Cordillera Blanca
Explanation:
The image of the point
(
−
1
,
−
1
)
(−1,−1) under a translation is
(
4
,
4
)
(4,4). Find the coordinates of the image of the point
(
−
6
,
5
)
(−6,5) under the same translation
Answers
Answer:
Bro use des-mos
Explanation:
Which of the following situations best demonstrates direct rule?
A.
Local rulers have significant autonomy.
B.
Local administrators make day-to-day decisions.
C.
Colonial powers utilize existing political systems.
D.
Colonial administrators hold government positions.
Answers
Answer:
D
Explanation:
1 2 3 4 5 6 7 8 9 10 The three basic economic questions include all the following except __________. A. who will use the products produced B. what goods and services to produce C. how the products will be produced D. who will produce the products Please select the best answer from the choices provided A B C D
Answers
Answer:
muffin
Explanation:
cuz it tates good
Not an answer...
Explanation:
What is the Judaism distribution?
Answers
Answer:
Judaism is mostly found in the USA and Israel, and in a smaller scale in some of the European and South American countries, though there are in other countries around the world.
Explanation:
Judaism is one of the oldest religions in the world that has managed to survive in modern times. It is the first of the Abrahamic religions and it has been the basis for the formation of Christianity and Islam later in history. The followers of this religion have been the subject of persecution and genocide multiple times throughout history, which has led to stagnation of the number of followers or drop of it.
Nowadays, the USA has the biggest number of Jews, around 12 million, while Israel, the only Jewish dominated country, has around 6.5 million Jews. Only three other countries have over half a million Jews and those are France, Canada, and Russia. Other countries where there are Jewish communities that number more than 100,000 people are the West Bank, UK, Argentina, Germany, Ukraine, Brazil, Australia, and Hungary.
Which of these statements best explains how the discovery of the New World affected the population of the New World?
O Only English colonists migrated to the New World which caused a small increase in population.
O With the increased number of colonists, the cost of producing food declined.
With the spread of smallpox, the Native American population declined causing overall levels of population in North America and South America to decrease.
With the trading of precious metals such as gold and silver, many Europeans choose to stay in Europe and allow the Africans to bring the metals to Europe, therefore, population levels in the New World remained constant.
Answers
Answer:
With the spread of smallpox, the Native American population declined causing overall levels of population in North America and South America to decrease.
It's the best explanation on there.
rod wave? no not as cute and cool as my dog
Answers
Answer:
Lol Im sure your dog is adorable. what kind is it?
Explanation:
Answer:
yes ur right i agree so can i have brainly please ill give u points
Explanation:
PLS help me with THIS ASAP
WILL MARK AS BRAINLIEST IF CORRECT
Answers
Answer:
north pole is A
south pole is I
prime meridian is L
Explanation:
what term describes the exchange of animals, plants, disease, ideas and culture between European countries and their colonies in Latin America?
Answers
Answer: The Columbian Exchange
Explanation: The term is used to describe the enormous widespread exchange of plants, animals, foods, human populations (including slaves), diseases, and ideas between the Eastern and Western hemispheres that occurred after 1492.
Match the letter with the name of the place it represents on the map,
Answers
Answer:
A- Great Lakes (specifically lake Superior)
B- Missouri River
C- Baird Mt?
D- Badlands National Park/ Mt Rushmore
E- Great Plains
F- Death Valley/Sierra Nevadas
G- Great Salt Lake
H- Grand Canyon
Explanation:
The collision of the subcontinent of India and Asia started forming the ________ approximately 50 million years ago.
Answers
Answer:
Himalayan Mountains
Explanation:
If you look at the location of the Himalayas on a map, you can see that they line the border of India and the Tibetan plateau.
How have human systems and political systems shaped Central America and the Caribbean?
Answers
Answer: This quesiton can cover many topics, but if you want the most basic ones it could be transportation, culture, and the form of government
Explanation:
Many of the countries are still developing, and because of this, their governments are corrupt as heeeeeeckk. Presidents and government officials tend to steal money from its people a lot, through everything. This is because of very weak law enforcement and the limiting of powers. This causes for the economy and education in the country to go down. This also causes more poverty, which means less people go to school and get careers. This is one of the big reasons why I appreciate the free education in the U.S., we are very privileged and we should be grateful for the things we have that others wish to obtain. :(
The Panama Canal improved transportation a thousand times better. People from California or Asia had to go around South America through boat, and this took about 12 - 14 months. When the canal was built, the time decreased to about 3 months (which is a lottt). It also decreased the deaths from starvation or hitting icebergs at the south.
The cultures across the countries are very different due to different conquerors during the Colonization Era back in the 17th century. Spanish, British, French, Dutch, etc. conquered many parts of land, so that’s why Mexico speaks Spanish while its neighboring country, Belize, speak English. The culture diversity is very high in the Americas.
Using the rule of 70 for doubling time, in how many. years will the population of mali double if its present rate of natural increase is 3.6, assuming all other indicators stay. constant
A. 20 years
B. 40 years
C. 60 years
D. 80 years
E. 100 years
Answers
The time it will take for the population of mali to double is 20 years. Which is the correct answer would be an option (A).
What is the rule of 70 for doubling time?The rule of 70 for doubling time is defined as the time it will take for your investment to double and is calculated by dividing your growth rate by 70.
For example, if your mutual fund has a four percent growth rate, divide 70 by three. Thus, the doubling time is 17.5years because 70 divided by three is 17.5.
We have to determine using the rule of 70 for doubling time, in how many. years will the population of mali double if its present rate of natural increase is 3.6.
We have been given that the present rate of natural increase is 3.6.
According to the rule of 70 for doubling time,
70 divided by the growth rate of 3.6
⇒ 70/3.6
⇒ 19.44 ≈ 20
Therefore, the time it will take for the population of mali to double is 20 years.
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The Persian Empire was brought to an end by _____. Cyrus the Great Meroë Alexander the Great Ezana
Answers
Answer:
Alexander the Great brought the Persian Empire to an end.
Explanation:
The Persian Empire was the most powerful empire and the largest empire for a very long time. It had territory stretching from northwestern South Asia to Asia Minor, and from Central Asia to the Indian Ocean. The empire functioned very well despite having a lot of different ethnic, cultural, and religious groups, it was an empire for example.
This all came to an end with the rise of the Macedonian Kingdom that turned into a Macedonian Empire. With Phillip II of Macedon laying good foundations for Alexander by reforming the army, including the Paeonian cavalry, and neutralizing the Greeks, Alexander with his military knowledge and courage set his sights to the east. Despite being heavily outnumbered and all the odds being against him, Alexander and his Macedonian phalanx supported by the Paeonian cavalry went up against the massive Persian army which was also supported by Greek soldiers.
It took several battles, in which bit by bit Alexander was gaining ground, and in the final one at Gaugamela which was the biggest one of all he made the decisive win. This ended the Persian Empire for the time being, while made the Macedonian Empire the largest in the world.
Answer:
mark him brainliest
Explanation:
: )
Upwelling, the rising of water from deeper layers of the ocean, is a wind-induced movement that brings ________ water to the surface.
Answers
Answer:
Upwelling, the rising of water from deeper layers of the ocean, is a wind-induced movement that brings cold and nutrient rich water to the surface.
Explanation:
Marine resurgence is an oceanographic phenomenon that occurs when subsurface waters rise. These waters consist of a large amount of nutrients and have a lower temperature than surface waters, becoming colder. This phenomenon generally occurs in areas where primary production is high, or when there is strong fishing activity in the region.