What distinguishes a glacier from other regions that may be covered by snow?

Snow has many space for air into it buy glaciers do not contain any air gap and is compacted snow.

Explanation: Both Glacier and Snow are frozen form of water. Snow is the frozen form of precipitation which is differentiated from glaciers in terms of air and space inside it.

Snow crystals have lots of free form of crystal with lots of air inside it. Snow gets compacted to form glacier over a period of time.

Glaciers are the compacted form of snow which has been compressed over many years and has many layers of snow.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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