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Science Chapter 15
Section 1, 2, 3,4
33
Science
8th Grade
03/28/2012

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Term
composition of the atmosphere
Definition
made up of nitrogen, oxygen, carbon dioxide, water vapor, and many other gases
Term
weather
Definition
condition of earths atmosphere
Term
atmosphere
Definition
envelope of gases that surrounds the planet
Term
ozone
Definition
form of oxygen that has three oxygen atoms in each molecule instead of the usual two
Term
water vapor
Definition
water in the form of gas
Term
importance of the earths atmosphere
Definition
makes conditions on earth suitable for living things-providing warmth and liquid water
Term
properties of air
Definition
density, pressure, mass
Term
density
Definition
amount of mass in a given volume of air
Term
pressure
Definition
force pushing on an area or surface
Term
air pressure
Definition
result of weight of a column of air pushing down on an area
Term
measure air pressure
Definition
barometers
Term
two kinds of barometers
Definition
mercury and aneroid
Term
mercury
Definition
uses liquid
Term
aneroid
Definition
doesn't use liquid
Term
alititude
Definition
elevation - or distance above sea level
Term
air pressure decreases
Definition
as alitutde increases
Term
units of air pressure
Definition
millibars and inches
Term
as air pressure decreases
Definition
so does density
Term
four main parts of the atmosphere
Definition
troposphere, stratosphere, mesosphere, thermosphere
Term
troposphere
Definition
layer in which earth's weather occurs
Term
stratosphere
Definition
2nd layer of the atmosphere-contains the ozone
Term
mesosphere
Definition
temperature drops- layer that protects earths surface from being hit by meteoriods
Term
thermosphere
Definition
two layers - ionosphere, exosphere
Term
ionosphere
Definition
lower layer
Term
exosphere
Definition
farthest out layer
Term
pollutants
Definition
harmful substances in air, water, and soil
Term
sources of pollution
Definition
natural and human activities
Term
natural pollution
Definition
forest fires, soil erosion, dust storms, and volcanoes
Term
human pollution
Definition
burning fossil fuels
Term
burning fossil fuels causes
Definition
smog and acid rain
Term
photochemical smog
Definition
brown haze that develops in sunny cities--light , yellow
Term
acid rain
Definition
rain that contains more acid than normal
Term
in the u.s. the federal and state governments
Definition
have passed a number of laws and regulations to reduce air pollution
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