Our wonderful planet Earth is the only
planet in the solar system which can
sustain life. The Earth is at a right
distance from the Sun, which makes it
suitable for life. The oxygen, nitrogen
and carbon dioxide level are well
This brief description talks about how
great our planet was and what we did to
ruin it. It also talks about the
planets, the inner planets, inside of
the Earth and Earthís atmosphere.
There are nine planets in our solar
system. Those planets are Mercury,
Venus, Earth, Mars, Jupiter, Saturn,
Uranus, Neptune and Pluto. All these
planets orbit the Sun in the same way,
apart from Pluto. Scientists suggest
that Pluto is not part of our solar
system because Plutoís orbit around the
Sun is different.
Most planets in our solar system have
moons like Jupiter, Saturn, Neptune and
Uranus. Some planets like mars Mercury and
Venus donít have moons. The coldest
planet in the solar system is Pluto. Its
temperature is minus 390 F.
The inner planets are Mercury, Venus,
Earth and Mars. The inner planets are
separated from the asteroid belt which
is between Mars and Jupiter.
The hottest planet in our solar system
is Venus. Venus temperature can reach
900 F. Mercury surface temperature can
reach 870 F or plummet to minus 280 F.
Mars has the biggest mountain in the
solar system, Olympus Mons, which is 15
From space the Earth looks like a big
sphere. Earthís interior is made up of 4
layers. The first layer is the crust.
The crust is 15-22 miles deep from land
and 3-6 miles deep from the sea bed.
Below the crust is the mantle. The
mantle is the thickest part. It is about
1,800 miles deep. Under the mantle is
the outer core made mainly of iron and
nickel. Finally the core, which is also
made of molten iron & nickel.
The Earthís atmosphere can be divided
into 5 layers. Those five layers are the
troposphere, stratosphere, mesosphere,
thermosphere and exosphere. Earth's
atmosphere consists of nitrogen (78.1%)
and oxygen (20.9%), with small amounts
of argon (0.9%), carbon dioxide
(variable, but around 0.035%), water
vapor, and other gases.
distances and temperature of earth's 5
layers of atmosphere is:
Troposphere - 0 - 7/17 km, temperature
decreasing with height.
Stratosphere - 7/17 - 50 km, temperature
increasing with height.
Mesosphere - 50 - 80/85 km, temperature
decreasing with height.
Thermosphere - 80/85 - 640+ km,
temperature increasing with height.
The boundaries between these regions are
named the tropopause, stratopause and
atmosphere protects life on Earth by
absorbing ultraviolet solar radiation
and reducing temperature extremes
between day and night. 75% of the
atmosphere exists within 11km of the
stratosphere contains a thin layer known
as the ozone layer. The ozone layer
shields us from the Sunís harmful rays.
But now chemical gases, such as CFCs
once used in refrigerators are
destroying the stratospheric ozone. Huge parts
of the ozone layer are breaking every
day. The Sunís dangerous rays are
entering the Earth which can harm plants
and animal life on earth. We have to stop