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

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

The entire core is about …………….. km in diameter.

1. 5000
2. 6000
3. 7000
4. 8000

Gutenberg Discontinuity begins at the depth of ……………. km.

1. 2500
2. 2800
3. 2900
4. 2400

In which part of the earth is NIFE found? What is it composed of?