Crust - The rock that forms Earth's outer layer, Mantle - A layer of hot rock, Outer core - A layer of molten metal surrounding the inner core, Inner core - A dense ball of solid metal, Mineral - A naturally occurring solid that can form by inorganic processes and has a crystal structure and definite chemical composition, Crystal - The repeating pattern of a mineral's particles forms a solid., Igneous rock - Rock that forms from cooled magma or lava, Sedimentary rock - Forms when small particles of rocks or the remains of plants and animals are pressed and cemented together, Metamorphic rock - Forms when a rock is changed by heat or pressure or by chemical reactions, Rock Cycle - The series of processes that occur on Earth's surface and in the crust and mantle that slowly change rocks from one kind to another, Erosion - This involves the removal of rock particles by wind, water, ice, or gravity., Mechanical weathering - The type of weathering in which a rock is physically broken into smaller pieces, Chemical weathering - The process that breaks down rocks through chemical change, Soil - The loose, weathered material on Earth's surfaces in which plants grow, Humus - A dark-colored substance that forms when plant and animal remains decay,

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