Climates are classified according to two major factors:

• elevation and precipitation

• latitude and temperature

• elevation and latitude

• precipitation and temperature

Which of the following has caused repeating 100,000-year cycles of ice ages in the past?

• an increase in sun spots

• several major volcanic eruptions

• changes in Earth's orbit and the tilt of its axis

• continental drift

Clues to ancient climates were like come from...

• ice cores

• fossil tree rings

• plant pollens

• all of the above

Global warming is known as the gradual increase in _________________ of the atmosphere.

• precipitation

• sun spots

• temperature

• ocean currents

The most abundant greenhouse gas in the atmosphere is ___________________.

• oxygen

• nitrogen

• carbon dioxide

• argon

Earth's ozone layer is _____________________________.

• 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

Increased carbon dioxide may cause global warming by trapping more ____________ in the atmosphere.

• water
• gases
• heat
• water vapor

The conditions in an area over a long period of time?

• Climate
• Weather

Any amount of CO₂ (Carbon Dioxide) in the atmosphere is bad for our planet.

• True
• False

Changes from minute-to-minute, hour-to-hour, day-to-day

• Climate
• Weather