Question

Give geographical reason:

Mantle is the centre of earthquake and volcanic eruptions. 

Answer 1

1. Mantle lies below the crust and it is divided into two layers, viz. upper mantle and lower mantle. The upper layer of the mantle is in a liquid state and is called as 'Asthenosphere'. 'Astheno' means 'weak".
2. It is in this layer that magma chambers are found. Through these chambers, magma comes out on the earth's surface during volcanic eruptions.
3. Moreover, during endogenetic movements which occur in this layer, internal energy is released. This energy is responsible for; earthquake and volcanic eruptions.
4. Epicenters of deep seated earthquakes are found in this layer. Therefore, Mantle is the centre of earthquake and volcanic eruptions.