Earth's Atmospher
Earth's atmosphere is a mixture of gases that surrounds our
home planet. Besides providing us with something to breathe, the atmosphere
helps make life on Earth possible in several ways. It shields us from most of
the harmful ultraviolet (UV) radiation coming from the Sun, warms the surface
of our planet. It is divided into five layers. Most of the weather and
clouds are found in the first layer.
Gases in Earth's Atmosphere there are nitrogen and
oxygen are by far the most common; dry air is composed of about 78% nitrogen
(N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other
gases are also present in much lower amounts; each makes up less than 1% of the
atmosphere's mixture of gases. The atmosphere also includes water vapor. The
amount of water vapor present varies a lot, but on average is around 1%. There
are also many small particles - solids and liquids - "floating" in
the atmosphere. These particles, which scientists call "aerosols",
include dust, spores and pollen, salt from sea spray, volcanic ash, smoke, and
more.
Layers of Earth's Atmosphere. There are several different
regions or layers in the atmosphere. Each has characteristic temperatures,
pressures, and phenomena. We live in the troposphere, the lowest layer, where
most clouds are found and almost all weather occurs. Some jet aircraft fly in
the next higher layer, the stratosphere, which contains the jet streams and the
ozone layer. Higher still are the mesosphere, thermosphere and exosphere.
Without the protective layer of gases that make up Earth's
atmosphere, the harsh conditions of the solar system would render the planet a
barren, lifeless husk like the moon. The Earth's atmosphere protects and
sustains the planet's inhabitants by providing warmth and absorbing harmful
solar rays. In addition to containing the oxygen and carbon dioxide, which
living things need to survive, the atmosphere traps the sun's energy and wards
off many of the dangers of space.
Forty years ago, scientists warned that a hole in the layer
of ozone surrounding the earth could have serious effects on human health and
the environment. This problem is being solved thanks to a global agreement to
stop the use of ozone-depleting chemicals that damage the ozone layer. We can
help the earth for protect the ozone layer such as use products from plastic
less, plant trees, etc.
Milton Kazmeyer. (2019,June 5). Importance of the Earth's
Atmosphere. From https://sciencing.com/importance-earths-atmosphere-5070.html
WlKlPEDIA. (2019,June 5). Atmosphere. From https://en.m.wikipedia.org/wiki/Atmosphere
Ms.Phattharawadi Chaisiri
"In the completion of Gen61-123 Academic Reading and Writing Task4 "
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