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There are many types of pyroclastic rocks that are
produced. Tephra is the general term for rocks produced by an
explosive volcanic eruption. Tephra includes large dense blocks and
bombs, and small light rock debris such as scoria, pumice, and
ash.
Scoria is a vesicular (bubbly) glassy lava rock
with a chemical composition similar to basalt with more iron. Pumice is
a frothy obsidian rock. Volcanic bombs can be larger chunks of lava that
are basically spitted from the volcano. They are dense and look like a
bomb. Particles of volcanic ash are extremely small, but they are very
hard. If you breathe ash during an eruption, it can puncture your lungs
and cause damage
Tephra
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Scoria
Volcanic bomb
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