Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > Geology

hoodoo

Earth science; Geology

A column or pillar of rock produced by differential weathering in a region of sporadic heavy rainfall, commonly facilitated by joints and by rock layers of varying hardness.

hot spot

Earth science; Geology

A region of high heat flow on the Earth’s surface, thought to lie above a mantle plume.

humus

Earth science; Geology

The generally dark, more or less stable part of the organic matter in a soil, so well decomposed that the original sources cannot be identified.

hydraulic gradient

Earth science; Geology

The slope of the water table. Measured by the difference in elevation between two points on the slope of the water table and the distance of flow between them.

hydrograph

Earth science; Geology

Graph of variation of stream flow over time.

hydrolysis

Earth science; Geology

A decomposition reaction involving water, in which hydrogen ions (H+) or hydroxyl ions (OH-) replace other ions. The result is a new residual mineral. Example: the addition of ...