Question

30. Describe the important features of three types of rocks​

Answer 1

Explanation:

There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers.

Answer 2

Answer:

There are three kinds of rock: igneous, sedimentary, and metamorphic.

igneous rocks :

1. The igneous form of rocks does not include any fossil deposits.

2. Most igneous forms include more than one mineral deposit

3. They can be either glassy or coarse.

4. These usually do not react with acids.

Sedimentary rocks :

1. Sedimentary rocks are largely found on the Earth's surface.

2. They cover 75% area of the Earth.

3. These rocks are generally not crystalline in nature.

4. They are soft and have many layers as they are formed due to the deposition of sediments.

Metamorphic rocks :

1. Metamorphic rocks were once igneous or sedimentary rocks.

2. they have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth's crust.

3. They are crystalline and often have a “squashed” (foliated or banded) texture.

4. Circulation of rock results in huge number of mineral water chemical reactions which results in different kinds of precious metals and stones.

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