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Science C1

Harcourt Unit C Chapter 1

QuestionAnswer
core The dense center of Earth; a ball made mostly of two metals, iron and nickel
plate Continet-sized slab or Earth’s crust and upper mantle
earthquake A vibration, or shaking of Earth’s crust
fault A break in the Earth’s crust along which rocks move
crust Earth’s outer layer; includes the rock of the ocean floor and large areas of land
mantle The thickest layer or Earth; found just below the crust
magma Melted rock inside the Earth
lava Melted rock that reaches the Earth’s surface
vent In a volcano, the rocky tube through which magma rises toward the surface
magma chamber An underground pool that holds magma, below a volcano
focus The point underground where the movement of an earthquake first took place
epicenter The point on the surface of the Earth that is right above the focus of an earthquake
seismograph An instrument that records earthquake waves
volcano A mountain that forms when red-hot melted rock flows through a crack onto Earth’s surface
Created by: kdesaul
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