7. What are convection currents in the mantle caused by?
A. The core heats up magma and increases its density, so it rises.
B. The core heats up magma and decreases its density, so it rises.
C. The core cools down magma and increases its density, so it rises.
D. The core cools down magma and decreases its density, so it rises

Answer: b

Explanation:

Heat from the core and the mantle itself causes convection currents in the mantle. It’s getting hotter. When something gets hotter, it is less dense.

Calculate the electronic configration of
31
P
15

what are the four phase changes that result from an increase in energy and what are the four phase changes that result from a decrease in energy?

What type of battery is found in the common flashlight?
dry cell battery
wet cell battery

The primary cause of continental drift,earthquakes,and volcanic eruptions is?
A.the rotation of Earth on its axis
B.heat from the Sun warming Earth
C.the gradual sinking of Earth’s crust
D.lithospheric plates beneath Earth’s crust

Hydroelectric power plants capture the ______________ of falling water to generate electricity. The falling water turns a wheel called a turbine and ____________________ the mechanical energy of falling water into electrical energy.


Windmills capture the ____________________ of moving air to generate electricity. The moving air turns the blades of the windmill turning a turbine and changes the ___________________ energy of the moving air into electrical energy.


Fill in the blanks!

Thank you!