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4th Grade Social Science Unit 4
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The inner layer of the Earth. It is made up of metals.
core
The middle of layer of the Earth. It is made of rocks.
mantle
The outer layer of the Earth. It's made of rocks.
crust
Rocks formed when different materials are deposited in the same place. These rocks are usually found in layers.
sedimentary
Rocks formed when liquid magma cools and solidifies.
igneous
Rocks that have changed over time because of extreme pressure or heat.
metamorphic
The minerals in the rock.
composition
The shape of the grains in a rock.
texture
Where the rock is found and what it looks like.
appearance in nature
The grains of most minerals have an irregular _____. Some are arranged in sheets, others are perfectly geometrical.
shape
Minerals that have a perfect geometrical shape are called _______.
crystals
The way the surface of a mineral looks in reflected light.
lustre
The colour of a mineral when it is a powder.
streak
The ____ of some minerals is easy to see. With other minerals, a dirty surface can hide the _______.
colour
Weight of a mineral
density
How easy it is to scratch the surface of a mineral.
hardness


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