A) These are formed where the lavas coming out of volcanic eruption are highly viscous and rich in silica content
B) These are formed of light and less viscous lava with less quantity of silica
C) These are formed due to plugging of volcanic pipes and vents when volcanoes become extinct
D) None of the above
Correct Answer: B
Solution :[b] Basic lava cones are formed from basic lava which is characterized by low quantity of silica and high degree of fluidity. It cools and spreads over a large area hence the cone formed is of low height resembling a shield. They are also known as hawana type of cones.
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