The Layers Of Atmosphere | Air and Atmosphere | What is Atmosphere | Earth 5 Layers



hi friends

today's lesson is layers of atmosphere

Earth's atmosphere can be divided into

five main layers excluding the exosphere

the atmosphere has four primary layers

which are the troposphere stratosphere

mesosphere and thermosphere before going

into main topic we start from the earth

earth our home the earth is the third

planet from the Sun the Earth's distance

from the Sun is 149 million six hundred

thousand kilometres note the distance

from Earth to the Sun is called an

astronomical unit or au which is used to

measure distances throughout the solar

system it is the only planet known to

have an atmosphere containing free

oxygen oceans of liquid water on its

surface and of course life roughly 70%

of Earth's surface is covered by water

most of it in the oceans and 30% of

Earth's surface is land let's understand

the layers of atmosphere the atmosphere

layers an important role in making life

possible on earth by protecting our

earth from harmful UV radiations of sun

the atmosphere of Earth is the layer of

gases commonly known as air that

surrounds the planet of Earth and is

retained by Earth's gravity there are

four major layers of atmosphere above

the earth that are separated by

temperature each layers are separated by

an increasing or decreasing temperature

of the gases in the layer the first

layer of atmosphere from the

earth is troposphere starting at ground


he'll extends upward to about 10

kilometers 6.2 miles or about 33,000

feet above sea level

we humans live in the troposphere and

nearly all weather occurs in this lowest

layer most clouds appear here mainly

because 99% of the water vapor in the

atmosphere is found in the troposphere

air pressure drops and temperatures get

colder as you climb higher in the

troposphere the next layer up is called

the stratosphere the stratosphere

extends from the top of the troposphere

to about 50 kilometres 31 miles above

the ground

the infamous ozone layer is found within

the stratosphere ozone molecules in this

layer absorb high-energy ultraviolet UV

light from the Sun converting the UV

energy into heat the stratosphere

actually gets warmer the higher the

trend of rising temperatures with

altitude that means air in the

stratosphere lacks the turbulence and

updrafts of the troposphere beneath

commercial passenger jets fly in the

lower stratosphere partly because this

less turbulent layer provides a smoother


the jet stream flows near the border

between the troposphere and the

stratosphere the third layer of the

atmosphere is mesosphere it extends

upward to a height of about 85

kilometres 53 miles above our planet

most meteors burn up in the mesosphere

unlike the stratosphere temperature is

once again grow colder as you rise up

through the mesosphere the coldest

temperatures in Earth's atmosphere about

minus 90 degrees Celsius minus 130

degrees Fahrenheit are found near the

top of this layer the air in the

mesosphere is far too thin to breathe

air pressure at the bottom of the layer

is well below 1% of the pressure at sea

level and continues dropping as you go


the thermosphere we're ionosphere is

directly above the mesosphere and below

the exosphere it extended up to 700

kilometers 440 miles above our planet

the thermosphere absorbed high-energy

x-rays and UV radiation from the Sun and

atoms turning them into ions with a

positive charge the temperature of the

thermosphere varies between night and

day and between the seasons as due to

numbers of ions and electrons which are

present the ionosphere reflects and

absorbs radio waves allowing us to

receive short away of radio broadcasts

from other parts of the world

temperatures in the upper thermostat and

high to 2,000 degrees Celsius 3632

degrees Fahrenheit or higher the

exosphere is the outermost layer of

Earth's atmosphere it extends from the

exobase which is located at the top of

the thermosphere at an altitude of about

700 kilometres above sea level to about

10,000 kilometres 6,200 miles 33 million

feet where it merges into the solar wind

this layer is mainly composed of

extremely low densities of hydrogen

helium and several heavier molecules

including nitrogen oxygen and carbon

dioxide closer to the exobase the atoms

and molecules are so far apart that they

can travel hundreds of kilometres

without colliding with one another

thus the exosphere no longer behaves

like a gas and the particle is

constantly escaped into space these free

moving particles follow ballistic

trajectories and may migrate in and out

of the magneto sphere or the solar wind