Q. Which of the following is/are the features of Acidic lava?
- Low percentage of silica.
- Volcanic cone is stratified
- Mostly occur along the destructive boundary
- Highly dense
Choose the correct answer using the codes given below:
Answer:
Only 2 & 3
Notes:
- Acidic lavas are highly viscous with a high melting point.
- They are light-coloured, of low density, and have a high percentage of silica.
- They flow slowly and seldom travel far before solidifying.
- The resultant volcanic cone is therefore stratified (hence the name stratovolcano) and steep-sided.
- The rapid solidifying of lava in the vent obstructs the flow of the out-pouring lava, resulting in loud explosions, throwing out many volcanic bombs or pyroclasts.
- Sometimes the lavas are so viscous that they form a lava plug at the crater like that of Mt. Pelée in Martinique (an island in the Lesser Antilles, Caribbean Islands).
- Andesitic lava flow occurs mostly along the destructive boundaries (convergent boundaries).