Draw a self-explanatory diagram showing the composition and structure of the Earth.

What is the rate of change of temperature inside the earth?

1. Temperature decreases at the rate of 1°C for every 32 metres of descent.
2. Temperature increases at the rate of 1°C for every 32 metres of descent.
3. Temperature remains constant
4. Temperature decreases at the rate of 32°C for every 1 metre of descent.

Sima is composed of …………… & ……………

1. Silica & Aluminium
2. Silica & Nickel
3. Silica & Magnesium
4. Silica & Ferrous

Gutenburg Discontinuity separates …………… & ……………

1. Crust & Core
2. Core & Mantle
3. Mantle & crust
4. Sial & Sima