AST Earth and Physical Science 2

Question 1

Which gas makes up the largest percentage of Earth's atmosphere?

Accepted Answer

Nitrogen

Answer

Nitrogen makes up approximately 78% of Earth's atmosphere.

Question 2

The principle that physical and chemical processes operating today also operated in the past is called:

Accepted Answer

Uniformitarianism

Answer

Uniformitarianism is the principle that geological processes have been consistent throughout Earth's history.

Question 3

When an object is in free fall (ignoring air resistance), what force acts on it?

Accepted Answer

Gravity only

Answer

In free fall with no air resistance, only the force of gravity acts on an object.

Question 4

The transfer of heat through direct contact between materials is called:

Accepted Answer

Conduction

Answer

Conduction is heat transfer through direct physical contact between substances.

Question 5

A mineral's resistance to being scratched is measured by its:

Accepted Answer

Hardness

Answer

Hardness measures a mineral's resistance to scratching, rated on the Mohs scale.

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