Physical geography

Physical geography

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Physical geography

Aphelion

Geography; Physical geography

It is the point in the Earth's orbit when it is farthest from the Sun (152.5 million kilometers). Aphelion occurs on the 3rd or 4th of July.

Anticline

Geography; Physical geography

A fold in rock layers that forms an arch.

Andisols

Geography; Physical geography

Soil order (type) of the United States Department of Agriculture Comprehensive Soil Classification System. These soils develop from parent materials that are volcanic in origin.

Andesite

Geography; Physical geography

An extrusive igneous rock that develops from a magma that is chemically between felsic and mafic and whose mineral crystals are fine.

Anaerobic

Geography; Physical geography

(1) Absence of molecular oxygen. (2) Occurring only in the absence of molecular oxygen. (3) Growing in the absence of molecular oxygen.

A group of double chained inosilicate minerals whose basic chemical unit is the tetrahedron (SiO 4 ). They are common rock forming minerals and are found in most igneous and metamorphic rocks. They ...