Pumice is a lightweight rock that sometimes forms when lava is very rich in a. silica b. gases c. feldspar d. volcanic glass

Pumice is a lightweight rock that sometimes forms when lava is very rich in volcanic glass. The correct option among all the options that are given in the question is the last option or option "D". It is a rough textured and highly vesicular rock. It is mostly light colored rock and might not contain crystals. 

He was very egry and lowselfof steam

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