Planet Earth

Front 1

Model

Back 1

a standard or example for imitation or comparison.

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Geologists

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a person who specializes in geologic research and study.

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Inner Core

Back 3

in geology, the innermost part of a core, specif. a solid sphere in the middle of the fluid core such as the iron-nickel core of the Earth.

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Outer Core

Back 4

liquid section of the central layers of earth.

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Mantle

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makes up about two thirds of earths mass

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Crust

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the outer layer of the Earth.

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Earthquakes

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a series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating.

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focus

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the first place that rocks break below the surface in a earthquake.

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seismic waves

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a wave of energy that is generated by an earthquake or other earth vibration and that travels within the earth or along its surface.

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Richter scale

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a scale, ranging from 1 to 10, for indicating the intensity of an earthquake.

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epicentre

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Also, epicentrum. Geology . a point, directly above the true center of disturbance, from which the shock waves of an earthquake apparently radiate.

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volcano

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a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals.

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surveyors level

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A device that measures minute changes in the angle of the grounds slope.

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weathering

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Geology . the various mechanical and chemical processes that cause exposed rock to decompose. Compare chemical weathering, mechanical weathering.

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erosion

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the process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves, etc.

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Deposition

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process of materials being laid down or deposited by wind, water, and ice

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mechanical weathering

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any of the various weathering processes that cause physical disintegration of exposed rock without any change in the chemical composition of the rock: Collision between rock surfaces can cause mechanical weathering.

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wind

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air in natural motion, as that moving horizontally at any velocity along the earth's surface.

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chemical weathering

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any of the various weathering processes that cause exposed rock to undergo chemical decomposition, changing the chemical and mineralogical composition of the rock: Oxygen and acids are agents in chemical weathering.

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sediment

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mineral or organic matter deposited by water, air, or ice.

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sedimentation

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the deposition or accumulation of sediment.

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fluvial landforms

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land forms that are created by water

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landsides

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the part of a plow consisting of a sidepiece opposite the moldboard, for guiding the plow and resisting the side pressure caused by the turning of the furrow.