Weather
 SOL 4.6
atmosphere
the layer of air that
surrounds our planet
air pressure
particles of air pressing
down on the Earth’s
surface
troposphere
the layer of the Earth’s
atmosphere closest to
Earth
stratosphere
the layer of the Earth’s
atmosphere containing
most of the
atmosphere’s ozone
greenhouse effect
the warming of earth
caused by the
atmosphere trapping
thermal energy from the
sun
air mass
a huge body of air
which all has similar
temperature and
moisture
front
the border where two
air masses meet
cirrus
wispy, high altitude
clouds that are made up
of ice crystals
cumulus
puffy cotton-ball clouds
that begin to form when
water droplets condense
at the middle altitudes
cumulonimbus
towering, dark rain
clouds with nimbus, or
halo, of gray-white
stratus
dark gray clouds that
form a low layer and
sometimes bring light
rain or snow
shower
barometer
measures air pressure
humidity
amount of water vapor
in the air
hygrometer
Instrument that
measures humidity