annar74 annar74

13-11-2020
Chemistry

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How do pumice and basalt form?

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13-11-2020

Answer:

Basalt forms when lava cools quickly at the surface. This quick cooling rate results in very small mineral grains. Pumice is formed when volcanoes erupt explosively. It comes from the same kind of magma which would form granite or rhyolite, that is, a magma that contains lots of silica (quartz). Magma with lots of silica is usually thick and sticky

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izzykissel izzykissel

13-11-2020

Answer:

"If magma with the same composition reaches the surface, it forms extrusive rocks such as rhyolite and pumice. Basalt is an extrusive igneous rock that forms the ocean floor. ... Also, water and wind break apart and carry away surface rocks. Then deeper rocks are uncovered at the surface."

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