1. ? What chemical element makes up about 21% of Earth's atmosphere

Nitrogen

Hydrogen

Carbon

1 _ 4

2. What is the name of the process in which water changes from a liquid state? to a gaseous state

Fusion

Freezing

Evaporation

2 _ 4

3. ? What chemical element makes up approximately 70% of the human body weight

Calcium

Water

Oxygen

3 _ 4

4. ? What chemical element is found in the Earth's atmosphere and protects the Earth from harmful sun rays

Ozone

Nitrogen

Oxygen

4 _ 4

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