Page 112 - Science Course 1 (Book 2)
P. 112
Mo9-L3c: What are the Layers of the Atmosphere?
Let’s Begin
Layers of the Atmosphere
The atmosphere has several different layers, each with
its own unique properties.
The atmospheric layer closest to Earth’s surface is called the troposphere.
The troposphere extends from Earth’s surface to altitudes between 8-15 km.
The temperature of the
troposphere decreases as
you move away from Earth.
Sunlight passes through the
atmosphere, warms Earth’s
surface, and the warmth is
radiated to the troposphere,
causing weather.
The stratosphere is the
atmospheric layer directly
above the troposphere.
The stratosphere extends from about 15 km Stratosphere
to about 50 km above Earth’s surface. 15 - 50 km
The area of the stratosphere with a high concentration of
ozone is referred to as the ozone layer.
Troposphere
The presence of the ozone layer causes the stratospheric 8 - 15 km
temperatures to increase with altitude.
Ozone has three oxygen atoms and absorbs the
Sun’s ultraviolet rays more effectively than oxygen.
UV–C
UV–B
UV–A
104
