Question

List two importance of igneous, sedimentary and metamorphic rocks.

Answer 1

Answer:

The types of rock: igneous, metamorphic and sedimentary

The three main types of geological rocks are described. They are...

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The types of rock: igneous, metamorphic and sedimentary

The three main types of geological rocks are described. They are...

by Mihai Andrei

February 23, 2020

Contents

1 The three types of rocks

2 Igneous Rocks

3 Metamorphic Rocks

4 Sedimentary Rocks

The three types of rocks

It’s the first thing you learn in a geology class — very briefly the three types of rocks are:

Igneous — they form from the cooling of magma deep inside the earth. They often have large crystals (you can see them with the naked eye).

Metamorphic — they are formed through the change (metamorphosis) of igneous and sedimentary rocks. They can form both underground and at the surface.

Sedimentary — they are formed through the solidification of sediment. They can be formed from organic remains (such as limestone), or from the cementing of other rocks.

Now the long story, which is much more interesting, is this:

Now, the long story, which is much more interesting, is this:

Igneous Rocks

Magma is the heart of any igneous rock. Magma is composed of a mixture of molten or semi-molten rock, along with gases and other volatile elements. As you go deeper underground, the temperature rises; go further and you’ll eventually reach the Earth’s mantle — a huge layer of solid rock surrounding the Earth’s core (which, in geologic time, behaves as a viscous liquid).

Answer 2

Two igneous rocks : plutonic and volcanic.

Two sedimentary rocks : rock salt, sandstone

Two metamorphic rocks : marble,quartzite