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Melting is when heat is applied to the rock and converts it into magma.

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Heat is the result of the movement of kinetic energy within a material or an item, or by a source of energy to a materials or an object. Pressure is defined to be the amount of force exerted per area. Immense heat and pressure drives the current rock into a metamorphic rock.

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Melting is when heat is applied to the rock and converts it into magma.

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Cooling means the removal of heat which results in a lower temperature or a change in the phase. The decrease in temperature by any other method is also called cooling. Magma or lava cools to form igneous rocks

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Heat is the result of the movement of kinetic energy within a material or an item, or by a source of energy to a materials or an object. Pressure is defined to be the amount of force exerted per area. Immense heat and pressure drives the current rock into a metamorphic rock.

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If sediments are buried deeply, it becomes compacted and cemented due to pressure (the amount of force exerted per area), forming sedimentary rock.

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Weathering refers to the dissolving of rocks and minerals but stay where they are while erosion is when rock particles are worn away and are moved away.

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Weathering refers to the dissolving of rocks and minerals but stay where they are while erosion is when rock particles are worn away and are moved away.

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For molten rock that is underground, scientists refer it as magma.

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Obsidian - a dark-colored glass formed when a molten rock material cools rapidly.

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Igneous rocks are formed when molten material cools, crystallizes, and solidifies.

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Photographs of some typical sediment types.

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Sediment is a solid material that was eroded by natural forces and has moved and deposited in a new location.

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Breccia - a clastic sedimentary rock that is composed of angular fragments.

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Sedimentary rocks are formed from pieces of other existing rock or organic material. They compose of different types such as clastic, organic, and chemical.

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Phyllite - a foliated metamorphic rock composed of flaky-shaped mica minerals in parallel alignment.

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Metamorphic rocks are rocks that have been changed from their original form. This is due to immense heat or pressure. While they began as a different kinds of rock, metamorphic rocks have undergone significant alteration from their igneous, sedimentary, or previous metamorphic forms.

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The rock cycle is an effective method to show how the three primary types of rocks connect to one another and how changes to rocks occur in a cyclical pattern.