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Geography

The study of physical characteristics of earth and the distribution and effects of life on earth, especially that of humans.

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abyssal

Geography; Geography

A term applied to the deepest parts of the ocean floor (mainly between 2200 and 5500 m), on which fine-textured deposits (ooze) have accumulated to considerable thicknesses over ...

acculturation

Geography; Geography

This occurs when a person comes into contact with a different culture, as, for example, when they move from one type of society to another. Almost inevitably, some of the habits, ...

accumulation zone

Geography; Geography

That part of a glacier or ice sheet lying above the equilibrium line, on which the dominant process is the addition of snow and ice. Winter snowfall and avalanches are the main ...

acid lava

Geography; Geography

Volcanic lava that is rich in silica and flows slowly owing to its high viscosity. Acid lava forms steep-sided, dome-like volcanoes.

active layer

Geography; Geography

In periglacial conditions, where permafrost exists, only the upper layer of ground thaws in summer. This upper layer, which is affected by summer thawing and winter freezing, is ...

activity rate

Geography; Geography

The proportion of the population in the working age group (usually 15 to 64 years for men and 15 to 59 years for women) who are registered as employed or who are unemployed but ...

adiabatic

Geography; Geography

The change of temperature in a gas that experiences compression (leading to heating) and expansion (leading to cooling), without any exchange of heat from outside. In the Earth's ...