The rocks like peat, lignite, bituminous and anthracite are example of:

1. Igneous rocks
2. Mechanical rocks
3. Metallic rocks
4. Carbonaceous rocks

The following pairs are the types of rocks on the basis of agents of their formation. Which of the following is incorrect?

1. Lacustrine : lake beds
2. Aeolian : sand particles
3. Glacial : ocean floor
4. Riverine : flowing waters of rivers.

Assertion (A): Igneous rocks are of interest to builders and sculptors.

Reason (R): Igneous rocks are usually compact.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

The transformation of rocks into metamorphic rocks takes place as a result of intense heat and pressure. Given below are the types of metamorphism and the processes involved. Which one is incorrect?

1. Thermal Metamorphism : high temperature.
2. Dynamic Metamorphism : pressure at great depths in the crust.
3. Regional Metamorphism : large scale earth movement.
4. Contact Metamorphism : high pressure below ocean bed.