Question 1

How would Earth be different without greenhouse gases in its atmosphere?

Accepted Answer

More heat from solar radiation would escape into space.

Answer

More solar radiation would be reflected back into space.

Answer

More heat from solar radiation would be stored in Earth’s core.

Answer

More solar radiation would penetrate Earth’s crust and mantle.

Question 2

What is a major source of air pollution?

Accepted Answer

small farms raising large numbers of animals such as cows and pigs

Answer

planting more trees in forest areas

Answer

building dams for hydroelectric plants

Answer

the production of energy using solar and nuclear power

Question 3

Which is a possible consequence of global warming?

Accepted Answer

an increase in the number of heat waves, causing droughts

Answer

a decrease in temperature, causing shorter growing seasons

Answer

a decrease in temperature, causing earlier frosts

Answer

an increase in the amount of coral reefs

Question 4

An iceberg breaks off of a glacier and floats into the ocean. In the ocean, the iceberg begins to melt. Which temporary effect does this melting have on ocean water in the immediate area of the iceberg?

Accepted Answer

The melting ice reduces the salinity of the ocean water.

Answer

The melting ice increases the acidity of the ocean water.

Answer

The melting ice lowers the freezing point of the ocean water.

Answer

The melting ice releases the carbon dioxide stored in ocean water.

Question 5

Which of these events is an example of a change in climate?

Accepted Answer

The average amount of annual precipitation decreases.

Answer

Afternoon clouds form and block the sunlight.

Answer

An overnight temperature drop causes frost to form.

Answer

A series of tornadoes occurs over a one-week period.

Question 6

Which is least likely to cause changes in global climate?

Accepted Answer

tsunami

Answer

radiation from solar flares

Answer

an El Niño event

Answer

a volcanic eruption

Question 7

Which of these human activities has caused the greatest increase in concentrations of atmospheric CO2?

Accepted Answer

burning fossil fuels

Answer

recycling

Answer

using nuclear power

Answer

planting trees

Question 8

Which could increase the amount of greenhouse gases in the atmosphere?

Accepted Answer

burning coal to produce electricity

Answer

planting trees in areas that have been deforested

Answer

reducing the use of gasoline-powered vehicles

Question 9

Visible light reaches Earth’s surface while infrared light is trapped as heat. Which characteristic of Earth’s atmosphere causes this to happen?

Accepted Answer

greenhouse effect

Answer

troposphere

Answer

ozone hole

Question 10

What can happen if the Earth continues to warm?

Accepted Answer

ice caps melt

Answer

decrease in heat strokes

Answer

decrease in severe weather

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