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Atmosphere

The atmosphere is composed of four main layers: the troposphere, stratosphere, mesosphere, and thermosphere. The troposphere is the lowest layer where weather occurs. The stratosphere contains most of the ozone layer which protects the Earth from ultraviolet radiation. The mesosphere is the coldest layer where meteors burn up. The thermosphere is the hottest layer and contains the ionosphere. Human activities like burning fossil fuels have accelerated the greenhouse effect and caused global warming. Reducing emissions through activities like planting trees and using renewable energy can help mitigate global warming.

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56 views29 pages

Atmosphere

The atmosphere is composed of four main layers: the troposphere, stratosphere, mesosphere, and thermosphere. The troposphere is the lowest layer where weather occurs. The stratosphere contains most of the ozone layer which protects the Earth from ultraviolet radiation. The mesosphere is the coldest layer where meteors burn up. The thermosphere is the hottest layer and contains the ionosphere. Human activities like burning fossil fuels have accelerated the greenhouse effect and caused global warming. Reducing emissions through activities like planting trees and using renewable energy can help mitigate global warming.

Uploaded by

sandeepjangra15
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ATMOSPHERE

ATMOSPHERE
The envelope of air surrounding the earth is called the
atmosphere.
COMPOSITION
Lowest and densest layer of the atmosphere.
Extends upto height 16kms =equator, 8kms = poles
All weather phenomena occur in troposphere.
Contains dust particles & water vapour.
Temp falls with increase in height.
 2nd layer of the atmosphere.

 Average altitude= 11 to 50 kms.

 Most of the ozone is contained here.

 Meteors entering the earth’s atmosphere get burnt here.

 Long distance aircrafts fly in lower part of this layer.


 3rd layer of the atmosphere.

 Occurs between stratosphere and thermosphere.

 Lies 50-80 Km above the Earth’s surface.

 Coldest atmospheric layer.

 Temp falls with elevation in this layer.

 Meteors burns while entering the Earth’s atmosphere.


 4th layer of the atmosphere.

 Lies 80-600 Km above the Earth’s surface.

 Located highest above the Earth’s surface.

 Hottest layer in the atmosphere.


Thermosphere

Ionosphere Exosphere
 Ionosphere reflects the radio signals back to the earth thus
making radio communications possible.
 Upper portion of the thermosphere.

 Acts as a filter to the radiations coming from the


sun.
 Ozone layer forms the thick layer in stratosphere.

 Protects earth from harmful radiations (Ultraviolet


Radiations).
OZONE LAYER DEPLETION
 The minimum OZONE LAYER DEPLETION is in 2019
DEPLETION IN OZONE LAYER

• Chlorofluorocarbons (CFC) have caused a severe damage in


ozone layer.
• The main cause of ozone depletion and the ozone hole is
manufactured chemicals, especially manufactured halocarbon
refrigerants, solvents, propellants and foam-blowing agents
(chlorofluorocarbons (CFCs), (HCFCs), (HALONs), referred to
as ozone-depleting substances (ODS).
Green house effect

 Natural warming process.

 Carbon di-oxide and other gases are always present in the


atmosphere.

 Human activities such as burning of fossil fuels and clear-cutting


of forests. , have accelerated the greenhouse effect and
caused GLOBAL WARMING
GLOBAL WARMING
 Global warming is the long-term heating of
Earth's climate system, due to human activities, such as fossil
fuel burning, which increases heat-trapping greenhouse gas
levels in Earth's atmosphere.
WAYS TO REDUCE GLOBAL WARMING

 Plant more trees.


 Reduce, Reuse, Recycle.
 Use Less Heat and Air Conditioning.
 Change your light-bulbs.
 Use Solar vehicles.
 Buy Energy-Efficient Products.
 Use Less Hot Water.

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