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The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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The process by which the porosity of a given form of sediment is decreased as a result of its mineral grains being squeezed together by the weight of overlying sediment or by mechanical means.

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The binding together of particles or other things by cement.

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Layers of rock, or sometimes soil. In nature, strata come in many layers.

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The action of surface processes that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transport it away to another location.

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The breaking down of rocks, soil, and minerals as well as wood and artificial materials through contact with the Earth's atmosphere, water, and biological organisms.

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A group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.

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A result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes.

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Types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.

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One of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.