LESSON 5

Multiple Choice

What is the main cause of collapsed clouds during gravitational contraction?

• Accretion of more materials leading to increased gravitational attraction

• Loss of heat energy

• Decrease in gravitational attraction

• Increase in temperature

Multiple Choice

Which of the following statements about radiogenic heat is correct?

• It is produced by the radioactive decay of unstable elements.

• It is the heat produced by the Sun.

• It is caused by gravitational contraction.

• It is produced by the compaction of dust clouds.

Fill in the Blank

Earth's thermal budget is the measure of the amount of heat that is released at the surface and produced in the ___.

Multiple Select

Select all the correct statements about Earth's thermal budget.

• 30% of solar energy is reflected back to space.

• 70% of solar energy is absorbed by the atmosphere, land, and oceans.

• All solar energy is absorbed by Earth.

• Most solar energy is reflected by the oceans.

Open Ended

Describe how the internal heat of the Earth fuels the planet’s dynamic processes.

Multiple Choice

What is the total percentage of solar energy absorbed?

• 70%

• 51%

• 19%

• 30%

Multiple Choice

What is the total percentage of solar energy reflected?

• 30%

• 51%

• 19%

• 25%

Open Ended

Discuss the factors that influence the formation of magma.

Fill in the Blank

Molten rock is also known as ___.

Open Ended

Where on Earth is it hot enough to melt rocks?