Name the boundary between the crust and the mantle which has characteristics of both layers.

1. Gutenberg Discontinuity
2. Crust Discontinuity
3. Mantlic Discontinuity
4. Mohorovicic Discontinuity

Assertion (A): The thickness of the lithosphere is very fragile compared to the nature and composition of the earth.

Reason (R): There are continuous changes in the earth's crust due to forces of nature.

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.

Mohorovicic discontinuity is found at about …………… beneath the oceans and …………… beneath the continents.

1. 8 km, 32 km
2. 36 km, 10 km
3. 60 km, 6 km
4. 40 km, 4 km

Extending upwards, the earth is enveloped by a blanket of gases. Name it.

1. Lithosphere
2. Hydrosphere
3. Atmosphere
4. Chamber