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14 terms

Ch 9- Earth's Changing Surface

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mechanical weathering
The breaking of rock into smaller pieces by forces due to gravity, ice, plant, roots or other forces.
crust
Earth's outermost and thinnest layer
sedimentary
Rocks that form when layers of materials and rock particals settle on top of eachother, than harden.
chemical weathering
The changing of materials in a rock by chemical processes.
core
The very center of Earth and is made of mostly iron
metamorphic
A type of rock formed when existing rock is heated at high temperature.
plates
Large section of Earth's crust that are constantly moving into, away from, and past each other.
mantle
The thickest of the Earth's layers, together with the crust, form the lithosphere.
igneous
A type of rock formed when magma cools and hardens.
Oceanic Crust
Mostly made of basalt it is about 6 to 10 kilometers thick and is below most of the ocean floor.
Continental Crust
Mostly made of granite and can be as thick as 75 kilometers. It can be under the ocean or make up land.
Lithosphere
made up of the top part of the mantle and the crust above it.
Characteristics to identify minerals
hardness, luster, shape, streak, texture, magnetism
Three Layers of Soil
topsoil, subsoil, bedrock

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