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Rocks & Earth's Layers
Types of rocks and layers of the Earth
18
Science
5th Grade
02/21/2016

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Term
Crust
Definition
Outer layer of the Earth
Term
Mantle
Definition
Layer beneath the crust; largest layer of the Earth that contains pockets of magma.
Term
Outer Core
Definition
Layer beneath the mantle where liquid nickel and iron are found.
Term
Inner Core
Definition
Center of the Earth; made of solid iron and nickel.
Term
Plate Tectonics
Definition
Theory related to the movement of continental and oceanic plates in the Earth's crust.
Term
Fault lines
Definition
Cracked boundaries or edges of tectonic plates.
Term
Convergent boundaries
Definition
Area where tectonic plates push together to form mountains or are pushed downward to form trenches.
Term
Divergent boundaries
Definition
Area where tectonic plates pull apart. Mid-ocean ridges are formed this way.
Term
Transform (also known as strike-slip or sliding) boundary
Definition
Area where tectonic plates slide past each other horizontally. Earthquakes are caused by these boundaries.
Term
Rock Cycle
Definition
The continuous cycle of rocks from one type to another over time.
Term
Magma
Definition
Liquid rock under the Earth
Term
Lava
Definition
Liquid rock on the Earth's surface
Term
Igneous Rock
Definition
Rock formed from cooled and hardened magma
Term
Sedimentary Rock
Definition
Rock formed from cemented sediment that has been deposited over time
Term
Metamorphic Rock
Definition
Rock formed from extreme heat and pressure within the Earth's surface.
Term
Weathering
Definition
Breaking down of rock material on the Earth's surface
Term
Erosion
Definition
Carrying away of broken down (weathered) rock material by wind or water on the Earth's surface
Term
Fossil
Definition
Remains of ancient plants and animals that have been preserved in rock.
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