Question 1

Why is the internal heat of the Earth important to life?

I. It fuels photosynthesis.

II. It causes plates to move.

III. It makes Earth like other planets.

IV. It causes the formation of landforms.

Accepted Answer

II and IV

Answer

I and III

Answer

III and IV

Answer

I and II

Question 2

How does radioactive decay contribute to Earth's internal heat?

Accepted Answer

To become more stable, radioactive atoms emit high energy particles and waves.

Answer

Radioactive atoms tend to have a less stable form.

Answer

Particles of dust origin collided and accumulated.

Answer

Materials in the earth moved and separated into layers.

Question 3

How does differentiation energy add to Earth’s internal heat?

Accepted Answer

Movement of materials produce friction that is converted to heat.

Answer

Planetesimals collided and grew into a terrestrial planet.

Answer

Radioactive isotopes emit high energy waves and particles.

Answer

Denser materials rise to the surface and lighter ones sink to the center.

Question 4

How does accretional energy add to Earth’s internal heat?

Accepted Answer

Planetesimals collided and grew into a terrestrial planet.

Answer

Movement of materials produce friction that is converted to heat.

Answer

Denser materials rise to the surface and lighter ones sink to the center.

Answer

Radioactive isotopes emit high energy waves and particles.

Question 5

Which of the following is NOT TRUE about Earth’s internal heat?

Accepted Answer

It comes from the sun.

Answer

Radioactive atoms contribute to around 50% of this heat.

Answer

It comes from Earth’s layers.

Answer

It is acquired during the early years of Earth’s life.

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