7th Grade Science Common Exam Review: Question Preview (ID: 19490)

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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

The jet-stream lies between which two layers of the Earth’s atmosphere?
a) thermosphere and ionosphere
b) mesosphere and thermosphere
c) troposphere and stratosphere
d) stratosphere and mesosphere

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 rivers deposit freshwater into the ocean
d) Most clouds form near or over the ocean

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) fluorocarbons
b) smog
c) acid rain
d) ozone

Which part of the atmosphere transmits radio waves, making it possible for us to listen to live radio music?
a) mesosphere
b) troposphere
c) ionosphere
d) stratosphere

Which is used in the classification of the layers of the atmosphere?
a) altitude
b) temperature
c) air pressure
d) pollutants

The burning of fossil fuels has been attributed to the accumulation of greenhouse gases and rising global temperatures. Which best explains this?
a) solar energy is collected during the 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) electrical energy is wasted during he burning of fossil fuels

The theory of global warming is based on the increase of what atmospheric gas?
a) carbon dioxide
b) helium
c) hydrogen
d) oxygen

Why would the Environmental Protection Agency seek to monitor atmospheric pollution and air quality?
a) to make sure the air pressure remains constant over time
b) to make it rain in drought affected areas
c) to maintain the respiratory health of humans
d) to reduce the amount of oxygen needed by rain forests

Why is the mesosphere colder than the troposphere?
a) Because the mesosphere is closer to the ground
b) Because the mesosphere contains ozone
c) Because molecules in the mesosphere are spaced farther apart
d) Because the molecules in the troposphere are spaced farther apart

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