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Plate Tectonics

Review of vocab and content

TermDefinition
earthquake happens at plate boundaries when rock breaks or hits causing shaking and trembling of the ground
plate boundaries edges of plates where rock breaks or hits
plates huge, irregularly-shaped pieces of Earth's crust
bedrock solid pieces of rock found below the soil or water on Earth's surface; creates the Earth's crust
convergent boundary plate boundary created when plates collide
divergent boundary plate boundary created when plates separate
subduction zone convergent boundary created when an denser ocean plate collides with a lighter land plate
subduction happens when the denser ocean plate sinks below the lighter land plate into the mantle where it begins to melt
volcano a weak spot in Earth's crust that lets magma rise to the surface; can form at divergent boundaries or subduction zones
fossil preserved remains or traces of things that lived long ago
sedimentation the second step of fossil formation which occurs when remains are covered quickly in layers of sediment
relative age the age of a rock or fossil compared to other rocks or fossils
igneous rock rock formed when magma or lava cools and hardens
sedimentary rock rock formed when layers of sediment solidify sometimes preserving a fossil inside
absolute age the exact numerical age of a rock or fossil
radioactive decay the process of an unstable atom changing into a stable atom, releasing radiation energy
half-life the time it takes for half of the radioactive atoms in a sample to decay
mountain landform created when two land plates collide
weathering breaking down of rock into smaller pieces
erosion moving broken rock (sediment) from one place to another
deposition laying down sediment in a new location
convection currents the circulation of heated materials; happens in the mantle because of heat from the core; causes plate movement
Created by: user-1491728
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