United 7 review

Global warming affects sea levels. Which of these is a likely consequence if the trend of global warming continues in coming decades?

• Melting glaciers will cause flooding of coastal towns and cities.

• Melting glaciers will reduce lake sizes in mountainous regions.

• Evaporation will increase land areas in U-shaped valleys, as fjords dry up

• Evaporation will enlarge land areas near coastlines, as sea levels drop.

Vehicle emission is one source of greenhouse gasses. We could reduce the greenhouse gasses by

• Changing our vehicles every year

• Using public transportation

• Doing regular vehicle maintenance

• Increasing the use of renewable energy sources

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

• The average temperature increases

• The average wind speed increases

• The average amount of annual precipitation decreases

• The average humidity decreases

Joan picked up a brochure on North Carolina and learned the facts listed below. ● It may experience either hot, humid summer conditions or more moderate summer conditions. ● The annual rainfall across the state ranges from 37 to 90 inches.

Which aspect of North Carolina was Joan focusing on from the brochure?

• Geography of NC

• Population of NC

• Climate in NC

• Economy of NC

Over geologic time, global mean sea level has varied significantly. Which change is MOST likely responsible for an increase in global mean sea level?

• erosion of sediment from a mountain range

• melting of polar ice caps

• increased volcanic activity

• increased ocean temperatures

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

• The tilt of the Earth's axis

• The greenhouse effect

When compared to current average conditions, which term would BEST describe conditions in Earth’s lower atmosphere if greenhouse gases were absent?

• Warmer

• Humid

• Cooler

• Drier

What will most likely influence global sea levels?

• Changes in ocean currents

• an increase in global temperatures

• Melting of polar ice caps

• Variations in atmospheric pressure

Why has the amount of carbon dioxide in the atmosphere increased?

• The sun has become brighter.

• The Earth's population has grown.

• . People have increased the burning of fossil fuels.

• Trees have been cut down.

Raising livestock, such as sheep and cattle, results in the production of large amounts of methane gas (CH4). Methane has a similar effect in the atmosphere as carbon dioxide (CO2). As more livestock are raised to provide food for humans, what is the MOST likely effect of the increase in methane?

• Decrease in air quality

• global warming

• Increase in air pollution

• Rise in sea levels