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deposition heat pressure organic materials plate tectonics The process of dropping, or depositing, sediment in a new location. The transfer of thermal energy form one substance to another. Amount of force exerted on a given area by an object or substance. Material broken down from dead organisms such as ancient decaying plants and animals. The theory scientists use to explain the movements of plates on the Earth's surface. fossil fuels coal A fuel formed from the remains of dead plants and animals. These materials are pressed together over millions of years to form coal, oil, and natural gas. Solid fossil fuel formed deep within the Earth over millions of years. oil (petroleum) Fossil fuel formed from the remains of ancient dead plants and animals. natural gas A fossil fuel gas, methane, usually found with petroleum deep within the Earth’s crust. A period that can be measured using a stopwatch or clock. time natural resources renewable resource nonrenewable resource inexhaustible resource water cycle Resources that are used by humans, such as minerals, water, fossil fuels, and food sources. Natural resources that can be renewed or replaced by nature, such as food crops and water. A resource that cannot be replaced in nature, such as metals and minerals. Natural resources that cannot be used up completely, such as solar energy, solar tides, and wind. The cycle in which Earth's water moves through the environment.