Consider the following statements about the igneous rocks; 1. Igneous rocks are normally crystalline in structure. 2. They occur in strata and contains fossils. 3. These rocks have no silica. Which of the statements given above is\are correct?

1 and 3 only
1 and 2 only
2 and 3 only
1 only

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 4 : 1 only

The correct answer is 1 only.

Igneous Rocks:
- Igneous rocks are formed by the cooling and solidification of molten rock (magma) from beneath the earth crust.
- They are normally crystalline in structure. Hence, statement 1 is correct.
- They do not occur in strata nor do they contain fossils. Hence, statement 2 is NOT correct.
- Igneous rocks may be sub-divided on the basis of mineral composition.
  - When they contain a high proportion of silica they are said to be acid. Hence, statement 3 is NOT correct.
  - Basic rocks contain a greater proportion of basic oxides, e.g. of iron, aluminium or magnesium, and are thus denser and darker in colour.
- In terms of origin, there are two main classes of igneous rocks.
  - Plutonic rocks
  - Volcanic rocks.

4 views Answered 2022-09-04 04:29

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