What term refers to the envelope of gases surrounding a planet?

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Multiple Choice

What term refers to the envelope of gases surrounding a planet?

Explanation:
The term refers to the gaseous layer that surrounds a planet, held in place by the planet’s gravity. This envelope is called the atmosphere. It differs from the lithosphere, which is the rocky outer shell; from the hydrosphere, which includes all water on, above, and below the surface; and from the magnetosphere, which is shaped by the planet’s magnetic field. In Earth’s case, the atmosphere is mainly nitrogen and oxygen and becomes thinner with altitude, forming layers such as the troposphere and stratosphere.

The term refers to the gaseous layer that surrounds a planet, held in place by the planet’s gravity. This envelope is called the atmosphere. It differs from the lithosphere, which is the rocky outer shell; from the hydrosphere, which includes all water on, above, and below the surface; and from the magnetosphere, which is shaped by the planet’s magnetic field. In Earth’s case, the atmosphere is mainly nitrogen and oxygen and becomes thinner with altitude, forming layers such as the troposphere and stratosphere.

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