Climate

Over the past 200 years, the level of carbon dioxide in the atmosphere has

• decreased slightly

• increased until recently, and then decreased

• increased steadily

• stayed about the same

The gradual increase in the temperature of Earth’s atmosphere caused by increased levels of carbon dioxide is called

• weather

• chlorofluorocarbons

• climate

• global warming

Earth's ozone layer

• has been thickening over the past several years.

• filters harmful ultraviolet radiation from the sun.

• exists only over Antarctica

• traps carbon dioxide in the stratosphere

Scientists predict that banning the use of chlorofluorocarbons will

• have no effect on the ozone layer.

• gradually restore the ozone layer.

• increase ultraviolet light reaching Earth.

• increase the rate of ozone depletion

People add the greenhouse gas _________________________ to the atmosphere by burning wood, oil, natural gas, and coal.

• nitrogen oxide

• hydrogen oxide

• carbon monoxide

• carbon dioxide

Humans have damaged the ozone layer by using _________________________ in refrigerators and spray cans and is the main cause of ozone depletion.

• chlorofluorocarbons (CFCs)

• carbon monoxide

• carbon dioxide

• carbon oxide

El Niño is a weather pattern that forms in the

• polar Pacific Ocean

• tropical Pacific Ocean

• tropical Atlantic Ocean

• polar Atlantic Ocean

Climates are classified according to two major factors:

• elevation and precipitation

• latitude and temperature

• elevation and latitude

• precipitation and temperature

A tropical, wet climate exists in the United States only in

• Oregon and Washington

• Florida

• Hawaii

• California

Sea and land breezes over a large region that change direction with the season are called ________________________.

• hurricanes

• tornados

• monsoon

• earthquakes