Question

Acid igneous rocks are formed of viscous magma. Give reason

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Answer 1

Answer:

The gases they contain escape easily as they are erupting, leaving holes, called vesicles, in the rock. Acidic magmas are very viscous, thick and sticky. These often erupt explosively, forming massive eruptions and pyroclastic flows, as happened at Vesuvius (79 AD) and Mount St Helen's (1980).

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Answer 2

Explanation:

The gases they contain escape easily as they are erupting, leaving holes, called vesicles, in the rock. Acidic magmas are very viscous, thick and sticky. These often erupt explosively, forming massive eruptions and pyroclastic flows, as happened at Vesuvius (79 AD) and Mount St Helen's (1980).