climate change

Front

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

Back

True

Front

What has caused repeating 125,000-year cycles of ice ages in the past?

Back

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

Front

Clues to paleoclimates come from...

• ice cores
• fossil tree rings
• plant pollens

Back

all of the above

Front

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

Back

temperature

Front

The most abundant greenhouse gas in the atmosphere is ___________________. Options: oxygen, nitrogen, carbon dioxide, water vapor

Back

water vapor

Front

What is the direct cause of rising sea levels?

Back

Melting Land Ice

Front

What is the best conclusion from the graph regarding atmospheric carbon dioxide levels?

Back

Atmospheric carbon dioxide levels have increased steadily since 1960.

Front

The main human activity that releases greenhouse gases is

Back

burning fossil fuels

Front

What gas from the list below is a cause for global warming? Urethane, Oxygen, Carbon Dioxide, Nitrogen

Back

Carbon Dioxide

Front

What do scientists think the effect will be of having more greenhouse gases in our atmosphere? Options: More warming of the atmosphere, More cooling of the atmosphere, More air in the atmosphere, Less air in the atmosphere

Back

More warming of the atmosphere