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Sponge though compressible is a solid Why

Sponge though compressible is a solid Why ? 

There are lots of pores found in a sponge which are filled with air. When a sponge is compressed the air trapped in the pores expelled out, and when it is
released, pores again filled with the air and a sponge comes in its original shape. 

Therefore, sponge is compressible because of air trapped in its pores and not because of the space between its particles as happens in the case of gas. Hence, sponge is a solid instead of it is
compressible.
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