Why is the
atmosphere
divided into
layers?
What causes temperature to decrease or
increase in each layer?
What causes temperature to decrease or
increase in each layer?
Receives highly
g y energized
g
radiation
from the sun; forms the ionosphere
Receives less radiation (heat) from
the sun
The ozone layer absorbs UV rays
heating this layer
absorption of the sun's
sun s energy
occurs at the ground which heats
the lower levels of the atmosphere
Air Pressure
„
„
Gravity pulls
gases toward
earth's surface
The amount of
force exerted
over an area of
surface is
called Air
pressure!
The first layerlayer-TROPOSPHERE
„
„
„
You live here!
All weather
h h
happens iin the
h troposphere.
h
More than half the air in the total
atmosphere is in this layer.
The second layer: STRATOSPHERE
„
„
„
Most jets fly in this
layer.
The ozone layer lies
at the top of the
stratosphere
The ozone protects
us from the ultraviolet
radiation of the sun!
The third layer: MESOSPHERE
„
„
The mesosphere is the coldest layer of the
atmosphere.
atmosphere
Meteors burn up in this layer.
The fourth layer: THERMOSPHERE
„
„
The thermosphere is the hottest layer of the
atmosphere.
The Ionosphere is found in the thermosphere
where curtains of light called auroras occur.
The upper layer of the thermosphere
iis called
ll d the
h EXOSPHERE
„
„
Satellites orbit earth
i th
in
the exosphere.
h
There is no clear
b
boundary
d
b
between
t
the exosphere and
outer space