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Rocks and Minerals — CHEMISTRY STD 6 — Question

ICSE BoardEnglish MediumSTD 6CHEMISTRYRocks and Minerals2 Marks
Question
Give reasons.
Many pumice rocks float in water.
✓

Answer

Pumice is a porous rock which is formed when lava cools quickly above the ground. It has many tiny pores which are formed by gases trapped inside them at the time of formation. These rocks are so light that many pumice rocks actually float on water.

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