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7th Grade Science Common Exam Review
Test Description: Part 1
Instructions: Answer all questions to get your test result.
1) Why is the mesosphere colder than the troposphere?
A
Because the mesosphere contains ozone
B
Because molecules in the mesosphere are spaced farther apart
C
Because the molecules in the troposphere are spaced farther apart
D
Because the mesosphere is closer to the ground
2) Why would the Environmental Protection Agency seek to monitor atmospheric pollution and air quality?
A
to maintain the respiratory health of humans
B
to reduce the amount of oxygen needed by rain forests
C
to make it rain in drought affected areas
D
to make sure the air pressure remains constant over time
3) The theory of global warming is based on the increase of what atmospheric gas?
A
oxygen
B
hydrogen
C
helium
D
carbon dioxide
4) The burning of fossil fuels has been attributed to the accumulation of greenhouse gases and rising global temperatures. Which best explains this?
A
electrical energy is wasted during he burning of fossil fuels
B
wind energy is produced during the burning of fossil fuels
C
thermal energy is released during the burning of fossil fuels
D
solar energy is collected during the burning of fossil fuels
5) Which part of the atmosphere transmits radio waves, making it possible for us to listen to live radio music?
A
ionosphere
B
troposphere
C
mesosphere
D
stratosphere
6) Which is used in the classification of the layers of the atmosphere?
A
air pressure
B
altitude
C
temperature
D
pollutants
7) Certain substances are classified as water pollutants, others as air pollutants, and still others as land pollutants. Which of the following pollutes all three parts of our environment?
A
smog
B
fluorocarbons
C
ozone
D
acid rain
8) Why does most of the rain that falls come from the ocean?
A
the majority of evaporation takes place over the ocean
B
the majority of precipitation takes place over the ocean
C
Most clouds form near or over the ocean
D
Most rivers deposit freshwater into the ocean
9) The jet-stream lies between which two layers of the Earth’s atmosphere?
A
thermosphere and ionosphere
B
troposphere and stratosphere
C
mesosphere and thermosphere
D
stratosphere and mesosphere
10) Which best explains the Earth’s greenhouse effect?
A
the ozone layer reflects ultraviolet radiation
B
air prevents heat from leaving Earthby trapping the outgoing long wave radiation
C
clouds prevent sunlight from reaching the Earth
D
green plants use sunlight to produce food
*select an answer for all questions
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