We review for the Social Science exam: Rocks
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Rocks
Types of rocks
Types of rocks
ROCKS
Rocks are inorganic natural substances. They are normally composed of more
than one mineral.
Rocks are divided into three types depending on how they are formed.
- Sedimentary rocks.
These were made from fragments of other rocks that
were transported by water, ice or the wind and have
become compacted. For example: clay.
They can also be formed from the remains of living
things, which have solidified over many years. For example, coal.
- Igneous rocks.
When magma comes out in volcanic eruptions, it cools and solidifies, forming new types of rocks. For example: granite and basalt.
Granite is composed of three minerals, quartz, feldspar and mica, which are easily visible on its surface.
- Metamorphic rocks.
These are sedimentary or igneous rocks that have been buried deep in the Earth and transformed by pressure and high temperatures. Examples: marble and slate.
Rocks are divided into three types depending on how they are formed.
- Sedimentary rocks.
These were made from fragments of other rocks that
were transported by water, ice or the wind and have
become compacted. For example: clay.
They can also be formed from the remains of living
things, which have solidified over many years. For example, coal.
- Igneous rocks.
When magma comes out in volcanic eruptions, it cools and solidifies, forming new types of rocks. For example: granite and basalt.
Granite is composed of three minerals, quartz, feldspar and mica, which are easily visible on its surface.
- Metamorphic rocks.
These are sedimentary or igneous rocks that have been buried deep in the Earth and transformed by pressure and high temperatures. Examples: marble and slate.
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