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PH Concepts in Action CH 24
Atmosphere
15
Science
9th Grade
04/23/2009

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Term
atmosphere
Definition
layer of gases that surround the Earth
Term
weather
Definition
condition of the atmosphere in a place at a given time
Term
rotation
Definition
spinning of the Earth on its axis
Term
revolution
Definition
movement of Earth around the sun
Term
tropic zone
Definition
region near the equator extending north and south to 23.5 degrees
Term
temperate zone
Definition
regiions in north and south hemisphere that is between the tropics and the polar regions
Term
polar zone
Definition
regions on north and south extending to 90degrees latitude
Term
solstice
Definition
two days a year when sun is directly overhead 23.5N or S
Term
equinox
Definition
days when length of day and night are approximately the same
Term
greenhouse effect
Definition
when lower atmosphere is warmed due to trapped gases in stmosphere
Term
climate
Definition
description of weather pattern in a place of many years
Term
desert
Definition
extremely dry region with less than 25cm of rain per year
Term
ice ages
Definition
periods when climates were colder than usual and glaciers covered a large portion of the Earth's surface
Term
El Nino
Definition
periodic warming of water in Pacific Ocean, forms warmer weather
Term
global warming
Definition
average temperature of atmosphere rising
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