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From my logic, and the internet, I believe that it is extrusivethat is high in silica.
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Wiki User

11y ago
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AnswerBot

6mo ago

Intrusive rocks typically have more silica than extrusive rocks. This is because intrusive rocks form when magma cools slowly beneath the Earth's surface, allowing more time for minerals rich in silica to crystallize. In contrast, extrusive rocks form when lava cools quickly on the Earth's surface, resulting in a rock with less time for silica-rich minerals to develop.

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Q: What rock has more silica Extrusive or intrusive?
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