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1. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks.
2. The outer core is about 1,400 miles thick, and it's made mostly of a combination (called an alloy) of iron and nickel, along with small amounts of other dense elements like gold, platinum, and uranium. These metals can, of course, be found on the surface of Earth in solid form.

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Structure of the Earth: Crust, Mantle and Core

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Textbook
YouTube (Videos)

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An elastic wave in the earth produced by an earthquake or other means

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Process in which energy moves from a location of higher temperature to a location of lower
temperature as heat; only the heat moves, not the material.

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Movement of material due to differences in temperature.

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Dense, dark igneous rock that makes up the mantle.

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Portion of Earth’s crust that makes up the seafloor.

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Thin brittle outer layer of Earth.

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Portion of Earth’s crust that makes up the continents.