Earth's Atmosphere_20240904_235643_0000.pdf

Earth Atmosphere

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On Earth, the atmosphere is
crucial for supporting life. It acts
as a protective shield, blocking
harmful solar radiation, and
helps regulate temperature by
trapping heat

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The atmosphere is composed
primarily of nitrogen (about 78%)
and oxygen (about 21%), with
small amounts of other gases like
carbon dioxide, argon, and water
vapor.

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The atmosphere not only
provides the air we breathe but
also plays a critical role in
protecting the planet and
maintaining conditions that
allow life to thrive.

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The lowest layer, where we live
and where weather occurs. It's
about 8 to 15 kilometers (5 to 9
miles) thick.

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Above the troposphere, this
layer contains the ozone layer,
which absorbs and scatters
ultraviolet solar radiation. It
extends up to about 50
kilometers (31 miles) above the
Earth.

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This is the middle layer where
temperatures decrease with
altitude, and it’s where most
meteorites burn up upon
entering the Earth's
atmosphere. It reaches up to
about 85 kilometers (53 miles)
high.

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In this layer, temperatures rise
significantly with altitude. The
thermosphere contains the
ionosphere, a region important
for radio communications and
the auroras. It extends up to
about 600 kilometers (373
miles).

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The outermost layer, where the
atmosphere gradually fades
into space. It contains very few
particles, and there’s no clear
boundary where the
atmosphere ends and outer
space begins.

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