Question

what
is
Atmosphere ?​

Answer 1

Answer:

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The atmosphere is the blanket of gases which surrounds Earth. It is held near the surface of the planet by Earth's gravitational attraction.

Without the atmosphere there could be no life on Earth. The atmosphere:

contains the air we breathe;

protects life from harmful radiation from the Sun;

helps keep the planet's heat from the Sun from escaping back into space;

is a major element of the water cycle;

keeps the climate on Earth moderate compared to that of other planets.

The atmosphere is made up of a mixture of gases, mostly nitrogen, oxygen, argon and carbon dioxide. It reaches over 500km above the surface of the planet. There is no exact boundary between the atmosphere and outer space. Atmospheric gases become thinner the higher up you go. The atmosphere just keeps getting less and less dense, until it "blends" into outer space.

The atmosphere is divided into four layers based on temperature: the troposphere, stratosphere, mesosphere, and thermosphere.

The Troposphere

This is the lowest layer of the atmosphere, closest to the surface of the earth. The troposphere varies in height in different parts of the world, from about 8km above sea level at the poles, to 16km at the equator. Within the troposphere, the temperature drops rapidly the higher you go.

This is the layer where we see clouds and most of the "weather" occurs.

The top layer of the troposphere is called the tropopause. Within the troposphere the temperature drops to a low of -56ºC. This marks the beginning of the tropopause. Through the tropopause, the temperature reverses and begins to increase. The height of the tropopause varies from the poles to the equator, but also from the summer to winter.

The Stratosphere

For a distance of about 18km above the tropopause, there is a layer called the stratosphere. In this layer, the pressure continues to decrease, but the temperature increases gradually to 0ºC.

Like the troposphere, the stratosphere also varies in thickness. It is quite deep over the poles and thinner over the equator.

The stratosphere contains a layer of ozone which absorbs the Sun's ultraviolet rays, protecting life on the earth's surface.

The top layer of the stratosphere is called the stratopause. In this layer the temperature, once again, begins to fall.

The Mesosphere

Explanation:

Answer 2

Explanation:

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• The atmosphere is the blanket of gases which surrounds Earth.
• It is held near the surface of the planet by Earth's gravitational attraction. Without the atmosphere there could be no life on Earth.

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Types of atmosphere:

1. Troposphere
2. Stratosphere
3. Mesosphere
4. Thermosphere
5. Ionosphere
6. Exosphere

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