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The Rock Cycle
Minerals, Rocks and Fossils
18
Science
3rd Grade
01/12/2011

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Cards

Term
Igneous Rock
Definition
Rock that was once melted but has cooled and hardened.
Term
Sedimentary Rock
Definition
Rock that is formed from material that has settled into layers. The layers are squeezed together until they harden into rock. You are most likely to find fossils in this kind of rock.
Term
Rock Cycle
Definition
The process by which one type of rock is changed into another type of rock.
Term
Sedimentary Rock-Rock Cycle
Definition
Wind and water break up metamorphic, sedimentary, and igneous rocks to form this kind of rock.
Term
Metamorphic Rock-Rock Cycle
Definition
When sedimentary, metamorphic, and igneous rocks are put under heat and pressure this type of rock is formed.
Term
Igneous Rock-Rock Cycle
Definition
When metamorphic, igneous, and sedimentary rocks melt, this type of rock is formed.
Term
Metamorphic Rock-Rock Cycle
Definition
Heat and pressure can change igneous rocks into this type of rock.
Term
Fossil
Definition
What's left of a plant or animal that lived long ago.
Term
Mold
Definition
The shape of a plant or animal left in sediments when the rock formed.
Term
Cast
Definition
Formed when mud or minerals fill a mold.
Term
Imprints
Definition
Molds of leaves or other thin objects.
Term
Fossils
Definition
These help scientists learn how large a dinosaur was and whether it walked on two legs or four.
Term
Crust
Definition
The solid outer layer of the Earth.
Term
Core
Definition
The iron layer at the center of the Earth.
Term
Rock
Definition
A solid material made of minerals.
Term
Mantle
Definition
The Earth's hot, middle layer of soft rock.
Term
Mineral
Definition
A solid natural object that has never been alive.
Term
Metamorphic Rock
Definition
Rock that has been changed by heat and pressure
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