AST Earth and Physical Science 3

Question 1

What type of boundary exists where two tectonic plates move away from each other?

Accepted Answer

Divergent boundary

Answer

Divergent boundaries occur where tectonic plates move apart, often forming mid-ocean ridges.

Question 2

The law of conservation of energy states that energy:

Accepted Answer

Cannot be created or destroyed, only transformed

Answer

Energy cannot be created or destroyed — it only changes from one form to another.

Question 3

Which type of wave requires a medium to travel through?

Accepted Answer

Mechanical wave

Answer

Mechanical waves (like sound) require a physical medium, while electromagnetic waves can travel through a vacuum.

Question 4

The movement of continents over millions of years is explained by the theory of:

Accepted Answer

Plate tectonics

Answer

Plate tectonics explains how Earth's lithospheric plates move, causing continental drift, earthquakes, and volcanoes.

Question 5

A substance that speeds up a chemical reaction without being consumed in the process is a:

Accepted Answer

Catalyst

Answer

A catalyst lowers activation energy and accelerates reactions without being permanently altered.

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