Differentiation - when materials begin to separate from one another, Accretion - a growth in size; an increase in amount, Lower Mantle (Mesosphere) - third layer of the mantle, rock flows slower here than in the asthenosphere, reaches down until we reach the Earth's core, Continental Crust - The portion of the earth's crust that primarily contains granite, is less dense than oceanic crust, & is 20-50 km thick, Mantle - The layer of hot, solid material between Earth's crust and core., Outer Core - A layer of liquid molten iron and nickel that surrounds the inner core of Earth, Inner Core - A dense sphere of solid iron and nickel at the center of Earth, Oceanic Crust - thinner, more dense, younger crust making up the ocean floor, Convection Current - the movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another, Asthenosphere (Upper Mantle) - The soft layer of the mantle on which the lithosphere floats., Crust - The thin and solid outermost layer of the Earth above the mantle, Seismology - the study of earthquakes and seismic waves, Earthquake - sudden & violent shaking of ground, at times causes destruction, due to movements within the earth's crust or volcano, Focus - Point at the depth where the rocks ruptured to produce earthquakes; place where quake waves originate, Epicenter - Point on Earth's surface directly above an earthquake's focus, Body Waves - seismic waves that travel through the interior of Earth, Surface Waves - seismic waves that travel along the Earth's surface, Primary Waves (P-Waves) - Travels fastest through all material with a back & forth/vibrate movement in same direction as waves, Secondary Waves (S-Waves) - travel through solids & can change the shape, but not volume of the material they pass through; move slower than P waves, Rayleigh Waves - travel in backward-rotating elliptical motion, causing vertical & horizontal movement. Can pass through solid liquid gas,

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