Earth's internal Energy source

Question 1

Internal heat

Answer 1

• Cause of Earth’s activity

Question 2

Primeval

Answer 2

• Retained from the ball of dust + gas from which the earth evolved.

Question 3

Radioactivity

Answer 3

• Greatest source of heat energy

- Decay - uranium and potassium

Question 4

Convection current

Answer 4

• Occur in the mantle generated by the core

Question 5

Magma

Answer 5

• Molten rocks, gases and liquid from the mantle accumulating in vast chambers at great pressures deep in the lithosphere
• Known as magma when on surface

Question 6

Igneous rocks

Answer 6

• Rocks formed by the cooling of molten magma

Question 7

Intrusive

Answer 7

• Magma that cools, crystalises + solidifies slowly below the surface

Question 8

Extrusive

Answer 8

• Lava that is in contact with the air/sea

- It cools, crystallises + solidifies far quicker than magma that is still underground