Even though sponge is a solid, there exist holes in the sponge in which air is present. When sponge is compressed, this air is expelled. The particles of sponge are compressed to a very small extent.
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There are no gaps filled with air in a wooden block which can be removed by compression. So on compression, the wooden block contracts negligibly. Nothing happens to the sponge when it is compressed. It is only the air filled in its gaps which is expelled on compression.
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Though, sponge is a solid it can be compressed easily because it has many Empty spaces inside it in which air can be passed on.. where as, in wooden it is a solid .. which is tightly packed, nd there is very less place inside it it cannot be compressed easily.
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