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- The atmosphere is the gaseous layer that surrounds the Earth.
- It is frequently referred to as air.
- Other planets and some of their larger moons have atmospheres as well.
- The atmosphere is made up of a variety of gases.
- Gravity is the force that keeps the gases near to the Earth.
- The atmosphere at the Earth’s surface is roughly three-fourths nitrogen and one-fifth oxygen.
- The atmosphere contains primarily hydrogen and helium at greater heights.
- Atmospheric pressure is the weight of the air.
- It is also referred to as barometric pressure.
- At sea level, the pressure is strongest.
