Unit 2 Science Test - 6th Grade

Front

What type of energy source is nuclear energy classified as?

Back

Nonrenewable

Front

What is the layer of Earth's atmosphere where atoms and molecules escape into space?

Back

Exosphere

Front

What is the name of the outermost layer of the atmosphere, which extends from 320 km to outer space?

Back

Exosphere

Front

What chemical compound is known to destroy ozone molecules in the stratosphere?

Back

CFC (Chlorofluorocarbon)

Front

What are the primary gases found in the exosphere?

Back

Hydrogen and Helium

Front

At what altitude does the exosphere begin?

Back

Approximately 600 km above Earth's surface.

Front

What is the significance of the ozone layer in the stratosphere?

Back

It absorbs harmful ultraviolet (UV) radiation from the sun.

Front

What human-made chemicals have contributed to ozone depletion?

Back

Chlorofluorocarbons (CFCs) and other ozone-depleting substances.

Front

What is the approximate temperature range in the exosphere?

Back

Temperatures can reach up to 1,500 degrees Celsius (2,732 degrees Fahrenheit).

Front

How does the density of gases in the exosphere compare to other layers of the atmosphere?

Back

The density of gases in the exosphere is extremely low.