The sun's rays are most direct near the equator.

• True

• False - near the poles

• False - at high altitudes

• False - far from the ocean

Which of the following has caused repeating 125,000-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 paleoclimates 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

• water vapor

What is the direct cause of rising sea levels?

• Melting Sea Ice

• Melting Land Ice

• Climate Change

Which of the following is the best conclusion that can be made from this graph?

• atmospheric carbon dioxide levels have been decreasing since 1960
• Hawaii has a lot of carbon dioxide
• humans have been working hard to decrease carbon dioxide levels
• atmospheric carbon dioxide levels have increased steadily since 1960

The main human activity that releases greenhouse gases is

• using public transportation and there by reduce the affects of greenhouse gases.

• burning fossil fuels

• texting on cellphones

• eating meat

What gas from the list below is a cause for global warming?

• Urethane

• Oxygen

• Carbon Dioxide

• Nitrogen

What do scientists think the effect will be of having more greenhouse gases in our atmosphere?

• More warming of the atmosphere
• More cooling of the atmosphere
• More air in the atmosphere
• Less air in the atmosphere