Geography

Geography

USA

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Geography

hot spot

Geography; Geography

An area in the middle of a lithospheric plate where magma rises from the mantle and erupts at the Earth's surface. Volcanoes sometimes occur above a hot spot.

humus

Geography; Geography

Partially decomposed organic soil material.

hydrography

Geography; Geography

The study of the surface waters of the Earth.

hydroponics

Geography; Geography

The growing of plants, especially vegetables, in water containing essential mineral nutrients rather than in soil.

The water that covers 71 percent of the Earth's surface as oceans, lakes, rivers, and streams. The hydrosphere also includes ground water, water that circulates below the Earth's surface in the upper ...