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Continental Crust
Crust that makes up continents; Composed of granite rock; Less Dense & Thick; Older
Oceanic Crust
Crust found under the ocean; Composed of basalt rock; Denser & Thinner; Younger
Radiometric Dating
An analysis of the data of an object based on the radioactive decay of the elements in the object
Isotopes Half-Life
The amount of time for half of the original(unstable isotope) to change into the more stable isotope
Plate Tectonics
Theory that states that pieces of Earth’s lithosphere are in constant, slow motion, driven by convection currents in the mantle
Mid-Ocean Ridge
Long chains of underwater mountains extending the length of the ocean
Trench
Long, curved valleys along the edges of some ocean basins
Rift Valley
Places on Earth’s surface where the crust stretches until it breaks
Accretion
When gravity causes matter to come together and form larger bodies
Erosion
The act of water, ice, or wind moving, transporting, & depositing material to other locations
Weathering
The breakdown or dissolving of rock into smaller pieces, by either chemical or physical processes
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