What is the condition of Earth’s atmosphere at a

particular timeand place ?

weather

Fill in the Blank

Earth’s atmosphere makes conditions on Earth ________

for living things.

suitable

What is a form of oxygen that has three atoms instead of the

usual two?

ozone

What two gases make up most of the air?

1. nitrogen 2. oxygen

What is water in the form of a

gas?

water vapor

What are harmful substances in the air, water or soil

called?

pollutants

What is the cause of most air pollution?

burning fossil fuels

What fraction of the air pollution from human activities comes from cars and other motor

vehicles?

almost ½

List 5 natural sources

of air pollution.

1. Ocean waves2. Wind blowing molds & pollen3. Forest fires4. Soil erosion5. Dust storms6. Erupting volcanoes

What is the term that means the average number of pollen grains in a cubic

meter of air?

pollen count

What is an instrument used to measure changes in air

pressure?

barometer

What type of barometer consists of a glass tube open at the bottom end

and partially filledwith mercury?

mercury barometer

What are the 2 units of air

pressure?

1. inches of mercury2. millibars

Fill in the blank.As air pressure decreases, the density of air _____.

decreases

Name 2 ways that a mercury barometer is

different from ananeroid barometer.

An aneroid barometer An aneroid barometer is smaller than mercuryis smaller than mercurybarometer and does not barometer and does not contain liquid.contain liquid.

What layer of the atmosphere do we live

in?

troposphere

In what layer of the atmospheredoes the aurora borealis occur?

ionosphere

What layer do communicationsatellites orbit Earth?

exosphere

Which layer of the atmosphere has no definite outer limit?

thermosphere

What layer of the atmospherehas the coldest temperatures inthe atmosphere?

mesosphere

Fill in the blank.

Acid rain forms when _____and ____ combine with

water in the air.

nitrogen oxides and

sulfur oxides

List 3 other gases found in dry air,

besides nitrogen and oxygen.

1. Argon2. Carbon dioxide3. Neon4. Helium5. Methane6. Krypton7. Hydrogen

What layer of the atmosphereprotects Earth’s surface frombeing hit by most meteoroids?

mesosphere

What substance found in the stratosphere

absorbs ultraviolet energy from the sun?

ozone

What is the formula to calculate the density of air?

Density = Mass Volume

List the layers of the atmosphere in order moving up from the

Earth’s surface.

1. troposphere2. stratosphere3. mesosphere4. thermosphere • ionosphere• exosphere