A vent in the earth's crust from which fiery hot magma erupts from the earth's interior:

1. Plate
2. Tectonics
3. Volcano
4. Vent

Which of the following is NOT a cause of volcanic eruptions?

1. Heat from the sun
2. Plate Tectonics
3. Magma chamber
4. Heat and pressure inside the earth

During repeated eruptions the summit of a volcano may be blown up leaving a large depression called:

1. Caldera
2. Hot springs
3. Geysers
4. Circum belt

Assertion (A): Most volcanic eruptions take place near plate margins.

Reason (R): When these plates slide past each other or collide against each other due to intense heat inside the earth's core, their edges produce faults along the lines of weakness.

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.