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Answer :
Final answer:
Pumice or scoria are examples of igneous rocks with a pyroclastic texture, formed from a glowing avalanche during a volcanic eruption, which is different from other igneous rocks like basalt.
Explanation:
The type of igneous rock that has a pyroclastic texture, meaning it was formed from a glowing avalanche, is an example of an extrusive rock, such as pumice or scoria. These rocks get their textural characteristic from super heated volcanic ash and debris that explosively erupts from a volcano, creating an avalanche of molten material known as a pyroclastic flow.
As the gas-rich material is expelled from the volcano and then cools rapidly, it forms rocks with a porous or vesicular texture. The term 'pyroclastic' comes from the Greek 'pyro-', meaning 'fire', and '-clast', meaning 'broken'. These rocks are different from other igneous rocks like basalt, which is formed by the cooling of lava and makes up most of Earth's oceanic crust.
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