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| A layer of weak, warm rock that flows slowly over geological time. |
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| The hypothesis that the world's continents move slowly over Earth's surface. |
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| Places where tectonic plates are coming together. |
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| Earth's innermost layer, which is mostly iron and includes the inner core and outer core. |
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| Earth's surface layer, consisting of oceanic and continental crust. |
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| The amount of mass an object or material has compared to its volume. |
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| Places where plates are pulling apart. |
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| The study of the history, structure, and natural processes of planet Earth. |
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| A solid sphere of hot metal, mostly iron, at the center of Earth. |
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| Earth's outermost structural layer, consisting of cool, ridged rock. |
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| The lowest portion of the mantle, a zone of ridged rock. |
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| Molten rock inside Earth. |
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| A layer of thick, hot rock between the crust and core. |
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| A global system of underwater mountains created by seafloor spreading. |
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| Long, deep, steep troughs in the seafloor where an ocean plate sinks beneath an overlying plate. |
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| A shell of hot, liquid metal beneath the mantle and above the inner core. |
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| The theory that states that Earth's lithosphere id divided into large plates that slowly move around the globe. |
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| The process by which new lithosphere is created at midocean ridges as older lithosphere moves away. |
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| The sinking of oceanic lithosphere into the asthenosphere. |
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| The region where an oceanic plate sinks into the asthenosphere at a convergent plate boundary. |
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| Separate pieces of lithosphere that move on top of the asthenosphere. |
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| Places where tectonic plates slide along besides one another as they move. |
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| Sedimentary rocks formed from minerals precipitated out of solution. |
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| Sedimentary rocks that are composed of pieces of preexisting rock. |
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| An igneous rock that forms at Earth's surface. |
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| Rocks that contain crystals that are arranged in parallel bands. |
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| The remains or traces of ancient life forms. |
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| Rocks that form from magma that cools. |
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| Rocks that form from magma that cools underground. |
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| Magma that erupts at Earth's surface. |
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| Rock that has formed form existing rock that has changed because of temperature, pressure, or reactive chemicals. |
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| A naturally occuring, solid, inorganic, crystalline material with a definate chemical composition. |
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| Mineral deposites that are large enough to be mined for profit. |
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| A solid mixture of one or more kinds of minerals. |
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| A series of processes by which rock is formed, breaks down, and transforms into different kinds of rock. |
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| Rock that forms over time as rock is pressed together. |
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| Fragments of weathered rock or living organisms. |
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| Minerals that contain silicon and oxygen and make up more than 90% of Earth's crust. |
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| Parallel layers of sedimentary rock. |
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