Question

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□ □ is characterized by holes formed by gas bubbles that give the rock a spongy appearance.
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Explanation:

The rock type with holes from gas bubbles (spongy look) is Pumice (a type of volcanic rock, or more generally, vesicular rock). The key here is recalling rock types: vesicular (or specific like pumice) has gas - bubble - formed holes.

Answer:

Vesicular Rock (or Pumice, but Vesicular Rock is the general term for this texture - based rock type)