Answers

2015-09-22T14:58:16+05:30
Becoz there are pores fill with air present in sponges
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2015-09-22T14:59:53+05:30
This is because it not very hard like most other solids and contain holes where there is air. It is not very dense. SO it can be easily compressed.

:)
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When we press the sponge the air inside the pores of the sponge comes out. Hence the sponge can be compressed