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How hot is the mantle?

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How strong is the magnetic field?

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Magnetic field: a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

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Density: the degree of compactness of a substance.

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Mantle: Middle layer of the Earth; made of hot rock.

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Core: Innermost, densest layer of a celestial body.

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Seismic waves: an elastic wave in the earth produced by an earthquake or other means.

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Meteorite: a meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground.

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Hydrosphere: all the waters on the earth's surface

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http://www.youtube.com/watch?v=227okXKJpXA

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http://www.youtube.com/watch?v=BnpF0ndXk-8

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http://www.youtube.com/watch?v=yOGoKCK17a4

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The four major systems of Earth are the biosphere, lithosphere, hydrosphere, and atmosphere.

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Seismic waves bend after changing speeds from different materials.

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The lithosphere is composed of both the crust and the uppermost mantle. The lithosphere is a brittle, rigid solid. It is easily cracked or broken.

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The four major systems of Earth are the biosphere, lithosphere, hydrosphere, and atmosphere.

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Seismic waves go different speeds through different materials.

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The two types of crust are oceanic crust and continental crust.

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Meteorites formed in the early solar system.

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Gases, water, rock, and living organisms are all found at Earth’s surface.

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The crust is less than 1% of Earth by mass.