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What is inside Earth?- Chapter 1 Sections 1 and 2
Layers of the Earth
10
Science
6th Grade
12/08/2013

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Term
seismic waves
Definition
Vibrations that travel through Earth carrying the energy released during an earthquake.
Term
pressure
Definition
The force exerted on a surface divided by the area over which the force is exerted.
Term
crust
Definition
The layer of rock that forms Earth’s outer surface.
Term
basalt
Definition
A dark, dense igneous rock with a fine texture, found in oceanic crust.
Term
granite
Definition
A usually light-colored igneous rock that is found in continental crust.
Term
mantle
Definition
The layer of hot, solid material between Earth’s crust and core.
Term
lithosphere
Definition
A rigid layer made up of the uppermost part of the mantle and the crust.
Term
asthenosphere
Definition
The soft layer of the mantle on which the lithosphere floats.
Term
outer core
Definition
A layer of molten iron and nickel that surrounds the inner core of Earth.
Term
inner core
Definition
A dense sphere of solid iron and nickel at the center of Earth.
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