Type of Rocks

There are three main types of rocks: igneous, sedimentary, and metamorphic.

1. Igneous rocks: These rocks are formed from cooled and solidified magma or lava. Examples of igneous rocks include granite, basalt, and pumice.
2. Sedimentary rocks: These rocks are formed from the accumulation and compression of sediment, which can include sand, mud, and organic matter. Examples of sedimentary rocks include sandstone, shale, and limestone.
3. Metamorphic rocks: These rocks are formed from the transformation of pre-existing rocks due to heat, pressure, or chemical reactions. Examples of metamorphic rocks include marble, slate, and gneiss.

Here are some MCQs on Types of Rocks:

1. What are rocks?
a) Natural substances formed of minerals and/or organic matter
b) Man-made substances formed of chemicals
c) Living organisms made of cells
d) Artificial substances made of plastics and metals

2. Which type of rock is formed from the solidification of magma or lava?
a) Sedimentary rock
b) Metamorphic rock
c) Igneous rock
d) None of the above

3. What is the process by which sedimentary rocks are formed?
a) Melting and solidification
b) Heat and pressure
c) Weathering, erosion, deposition, and lithification
d) None of the above

4. Which type of rock is formed from the alteration of existing rocks due to heat, pressure, or chemical action?
a) Sedimentary rock
b) Metamorphic rock
c) Igneous rock
d) None of the above

5. What is the process by which rocks are broken down into smaller pieces by weathering and erosion?
a) Compaction
b) Cementation
c) Lithification
d) None of the above