Question

What is atmosphere? ​

Answer 1

Answer:

An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. 

Answer 2

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$\huge{\mathbb\colorbox{blue}{Define Atmosphere}}$

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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:

1. Contains the air we breathe;
2. Protects life from harmful radiation from the Sun;
3. Helps keep the planet's heat from the Sun from escaping back into space;
4. Is a major element of the water cycle;
5. 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.

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