the state of the atmosphere at a certain time and place
weather
the ______ has existed 4.6 billion years
atmosphere
based on observations of weather that have been collected over years
climate
the 2 major components that make up our atmosphere are oxygen and _____________
nitrogen
air is a mixture of particles and different __________
gases
the ozone is made up of oxygen molecules that contains 3 _____________
atoms
emissions from ______________ account for nearly half the primary pollutants by weight
vehicles
the bottom layer of the atmosphere
troposphere
the atmosphere ___________ as you travel away from Earth
thins
the atmosphere can be divided vertically into four layers based on ___________
temperature
bottom layer of atmosphere where temperature decreases with an increase in altitude
troposphere
temperatures increase in this layer because the ozone is concentrated here
stratosphere
third layer of the atmosphere
mesosphere
thin layer in the atmosphere
thermosphere
on Earth the lower you go the higher the ______________________
air pressure
June 21 is the summer ____________
solstice
the __________ solstice occurs on December 21 in the Northern Hemishere
winter
the region of the atmosphere above the mesosphere
thermosphere
the equinox that occurs on September 22
autumnal
the equinox that occurs on March 21
spring
__________ ___________ is the source of all clouds and precipitation
water vapor