6th grade ch 1 review
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What is the condition of Earth’s atmosphere at a
particular timeand place ?
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weather
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Fill in the Blank
Earth’s atmosphere makes conditions on Earth ________
for living things.
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suitable
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What is a form of oxygen that has three atoms instead of the
usual two?
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ozone
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What two gases make up most of the air?
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1. nitrogen 2. oxygen
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What is water in the form of a
gas?
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water vapor
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What are harmful substances in the air, water or soil
called?
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pollutants
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What is the cause of most air pollution?
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burning fossil fuels
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What fraction of the air pollution from human activities comes from cars and other motor
vehicles?
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almost ½
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List 5 natural sources
of air pollution.
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1. Ocean waves2. Wind blowing molds & pollen3. Forest fires4. Soil erosion5. Dust storms6. Erupting volcanoes
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What is the term that means the average number of pollen grains in a cubic
meter of air?
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pollen count
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What is an instrument used to measure changes in air
pressure?
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barometer
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What type of barometer consists of a glass tube open at the bottom end
and partially filledwith mercury?
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mercury barometer
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What are the 2 units of air
pressure?
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1. inches of mercury2. millibars
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Fill in the blank.As air pressure decreases, the density of air _____.
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decreases
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Name 2 ways that a mercury barometer is
different from ananeroid barometer.
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An aneroid barometer An aneroid barometer is smaller than mercuryis smaller than mercurybarometer and does not barometer and does not contain liquid.contain liquid.
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What layer of the atmosphere do we live
in?
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troposphere
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In what layer of the atmospheredoes the aurora borealis occur?
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ionosphere
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What layer do communicationsatellites orbit Earth?
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exosphere
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Which layer of the atmosphere has no definite outer limit?
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thermosphere
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What layer of the atmospherehas the coldest temperatures inthe atmosphere?
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mesosphere
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Fill in the blank.
Acid rain forms when _____and ____ combine with
water in the air.
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nitrogen oxides and
sulfur oxides
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List 3 other gases found in dry air,
besides nitrogen and oxygen.
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1. Argon2. Carbon dioxide3. Neon4. Helium5. Methane6. Krypton7. Hydrogen
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What layer of the atmosphereprotects Earth’s surface frombeing hit by most meteoroids?
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mesosphere
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What substance found in the stratosphere
absorbs ultraviolet energy from the sun?
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ozone
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What is the formula to calculate the density of air?
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Density = Mass Volume
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List the layers of the atmosphere in order moving up from the
Earth’s surface.
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1. troposphere2. stratosphere3. mesosphere4. thermosphere • ionosphere• exosphere