Presentation onPresentation onATMOSPHERE LAYERSATMOSPHERE LAYERS Presented

ToToDr. Amir Hossain BhuiyanAssociate Professor Adjunct Faculty (BUP)Environmental Studies

ByMd. Mahamud Zaman (B1506043)Md. Tajkinur Rahaman (B1506124)Md.Muaz Kabir Talha (B1506147)Khalada Husna Fariha (B1506120)Sanzida Mehnaz (B1506159)Munia Akter (B1506031)

Atmosphere layers are Atmosphere layers are the…the…

EXOSPHERETHERMOSPHEREMESOSPHERESTRATOSPHERETROPOSPHERE

Let’s find out where these Let’s find out where these layers are located in layers are located in relation to the Earth’s relation to the Earth’s surface and how they are surface and how they are affected by temperature.affected by temperature.

TroposphereTroposphere

The troposphere is the lowest layer of the atmosphere that lies next to the Earth’s surface.

TroposphereTroposphere

Most of the air that makes up the atmosphere is found in the troposphere.

TroposphereTroposphere

It extends to about 14 kilometers (around 9 miles) above the Earth

and is where virtually all weather takes place.

TroposphereTroposphere

As you move up into the troposphere the temperature decreases.

At the top of this layer the air temperature is about - 60°C (-76° F).

StratosphereStratosphere

The stratosphere begins at the top of

the troposphere (14 km/ 9 miles) and

extends to about

50 kilometers (31 miles) above the

surface of the Earth.

StratosphereStratosphere

As you move up into the stratosphere the air temperature actually increases.

StratosphereStratosphere

This occurs because of ozone.

Ozone is a gas that absorbs solar radiation and releases it as heat.

The stratospheric or "good" ozone protects life on Earth from the sun's harmful ultraviolet (UV) rays.

StratosphereStratosphere

The ozone layer/ ozonosphere is located at the bottom of the stratosphere.

MesosphereMesosphere

The mesosphere begins at about 50 kilometers (31 miles) above the Earth’s surface and extends to 80 kilometers (50 miles).

MesosphereMesosphere

As you move up into the mesosphere, the air temperature decreases.

Temperatures at the top of this layer can drop to -90°C (- 130°F ).

MesosphereMesosphere

Interestingly, this layer also protects the Earth.

Meteoroids entering Earth’s atmosphere usually burn up in the mesosphere.

Thermosphere Thermosphere

-The thermosphere is the outermost

layer of the Earth’s

atmosphere.

ThermosphereThermosphere

It begins at 80 km (50 miles) above the Earth and extends outward into space.

Sometimes the thermosphere and exosphere are listed as separate layers.

ThermosphereThermosphere

The higher you move in this layer, the higher the temperature.

Temperatures in the thermosphere can reach 1,800°C (3,300°F)!

ThermosphereThermosphere

The beautiful colors of the aurora borealis or northern lights occur in this atmospheric layer.

ThermosphereThermosphere

This is also where the space shuttle orbits the Earth!

ThermosphereThermosphereThe ionosphere is

found at the bottom of the thermosphere (close to the mesosphere).

The exosphere is located at the top of the thermosphere.

Exosphere Exosphere

•Beyond 100 km. is the start of the earth’s outermost atmospheric layer, marking the beginning of the outer space.

ExosphereExosphere

• The air particles here are hotter than the ionosphere.

• The temperature are very high because of the incessant bombardment f cosmic rays.

• Density is very low the collisions between particles are extremely rare.