When lava cools quickly on the Earth's surface, it forms 'X'. 'X' is a very light rock used as body scrubber and to polish floors. Identify 'X' in the above given paragraph.
Gneiss
Pumice
Basalt
Shale
A
Pumice
B
Gneiss
C
Basalt
D
Shale
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Solution
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Pumice is a type of volcanic rock, produced when lava with a very high content of water and gases is discharged from volcano. Pumice is a very light rock which is used as body scrubber and to polish floor.
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