In Words, 3

question 41

Multiple Choice

In words, 3.5 x 10¹¹ is (HINT: Write this number out before trying to answer the question.)

• A) 350 billion.
• B) 3.5 trillion.
• C) 350 million.
• D) 35 million.
• E) 35 billion.

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Definitions:

Ozone-Depleting Substances

Ozone-Depleting Substances are chemicals that cause the depletion of the ozone layer, which protects the Earth from harmful ultraviolet radiation.

Pre-1950 Ozone Levels

The concentration of ozone in the Earth's stratosphere before the significant increase in human-made emissions affecting the ozone layer.

Earth

The third planet from the Sun, uniquely supporting life within the solar system.

Chlorofluorocarbons

A group of man-made chemical compounds containing chlorine, fluorine, and carbon, historically used in refrigeration and aerosol propellants, but now known to deplete the ozone layer.