Physical geography

Physical geography

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Physical geography

Average global temperature

Geography; Physical geography

Average annual temperature of the Earth's entire surface atmosphere.

Available water

Geography; Physical geography

Portion of the capillary water that is available for plant root uptake.

Atom

Geography; Physical geography

Smallest unit of an element that still maintains its chemical characteristics.

Atmospheric stability

Geography; Physical geography

Relative stability of parcels of air relative to the atmosphere that surrounds them. Three conditions are generally described: stable, unstable, and neutral.

Atmospheric pressure

Geography; Physical geography

Weight of the atmosphere on a surface. At sea-level, the average atmospheric pressure is 1013.25 millibars. Pressure is measured by a device called a barometer.