Question

Q. Consider the following statements:

1. Pedology is the study of rocks.
2. Foliated and nonfoliated are two types of metamorphic rocks.
3. Igneous rocks are known as primary rocks.

Which of the above statement/s is/are correct?

• A.
  2 and 3 only
• B.
  1 only
• C.
  1, 2 and 3 only
• D.
  3 only

Answer 1

The correct option is A

2 and 3 only
Explanation:

Statement 1 is incorrect: Pedology is the study of soil in its natural environment. Science of rocks is known as Petrology.

Statement 2 is correct: Metamorphic rocks are divided into two major groups : foliated rocks and non-foliated rocks. Metamorphic rocks form under the action of pressure, volume and temperature changes. In the process of metamorphism, in some rocks, grains or minerals get arranged in layers or lines. Such an arrangement of minerals or grains in metamorphic rocks is called foliation.

Statement 3 is correct: As igneous rocks form out of magma and lava from the interior of the earth, they are known as primary rocks

Extra Information

A rock is an aggregate of one or more minerals. There are many different kinds of rocks which are grouped under three families in the basis of their mode of formation. They are : (i) Igneous Rocks – solidified from magma and lava; (ii) Sedimentary Rocks – the result of deposition of fragments of rocks by exogenous processes; (iii) Metamorphic Rocks – formed out of existing rocks undergoing recrystallisation