If volcanoes get their magmfor rom the crust below them, what can you say about the silica content of earths…

/in /by

If volcanoes get their magmfor rom the crust below them, what can you say about the silica content of earths…

If volcanoes get their magmfor rom the crust below them, what can you say about the silica content of earths crust I under the ocean?

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