The lava cone of a volcano is having steep sloping sides. Which of these can be said about the volcano?1. the lava must have been highly fluid.2. it must have high silica content.3. the volcano must have been explosive.Select the correct answer using the codes given below.

The lava cone of a volcano is having steep sloping sides. Which of these can be said about the volcano?
1. the lava must have been highly fluid.
2. it must have high silica content.
3. the volcano must have been explosive.
Select the correct answer using the codes given below.

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

Explanation:
If the lava is fluid, it will flow quickly and form a gentle slope. If the slope formed is steep, the lava must have been viscous. Viscous lava has high silica content and such volcanoes are explosive.