Test 3 Review

Which of the following shows the gases in the air we breathe in the correct proportions?

• About 78% Nitrogen, 21% oxygen and 1% other gases

• about 90% oxygen, 5% nitrogen, 3% carbon dioxide and 2% other gases

• about 99% oxygen and 1% other gases

• about 79% oxygen, 20% nitrogen and 1% other gases

Which layer of the atmosphere contains the ozone layer?

• troposphere

• stratosphere

• mesophere

• thermosphere

Which layer of the atmosphere is closes to the earth, and is where weather occurs?

• troposphere

• stratosphere

• mesophere

• thermosphere

What portion of the atmosphere is the hottest, thinnest part of the atmosphere, and the farthest up?

• stratosphere

• mesosphere

• thermosphere

• troposphere

Which layer of the atmosphere do meteors burn up?

• stratosphere

• mesosphere

• thermosphere

• troposphere

Which of the following is a natural reason for climate change?

• the greenhouse effect

• the depletion of the ozone layer

• Milankovitch cycles

• the loss of heat from the mesosphere

which of the following is the best explanation for the current trend of increasingly hotter global average temperatures?

• carbon dioxide released when we exhale

• sea level rise

• the depletion of ozone layer

• increased greenhouse gases due to burning fossil fuels.

Increase carbon dioxide levels in the air leads to

• increased acidity in the oceans

• a decrease in the amount of calcium carbonate available for shell-forming animals

• a breakdown of calcium carbonate shells due to high acid levels

• all of these are correct.

How do increased temperatures affect human health?

• The cardiovascular system has to work harder to cool the body.

• Heat makes some air quality problems worse, like ground level ozone and smog, and these make respiratory problems worse.

• Tropical diseases that are now restricted to warmer areas will move north as there are fewer and fewer days with freezing temperatures.

• All of these are ways that increased heat affects human health.

Which of these two are correlated, as shown by ice cores from glaciers?

• temperature and ice color

• atmospheric carbon dioxide and temperature

• methane and ice melting

• water vapor and cloud intensity