Under which condition below would you expect a coarse-grained extrusive rock like dacite to form?A.Quick cooling of lava occurring underwaterB.Lava slowly flowing out of a fracture in Earth's surfaceC.25 km beneath Earth's surfaceD.Within a zone of fractured rocks below Earth's surfaceSUBMITarrow_backPREVIOUS

Dacite is an extrusive igneous rock, meaning it forms from lava that cools and solidifies on the Earth's surface. However, the term "coarse-grained" implies that the rock has larger crystals, which typically form when the lava cools slowly, allowing the crystals more time to grow.

Looking at the options:

A. Quick cooling of lava occurring underwater - This would result in a fine-grained rock because the lava cools too quickly for large crystals to form.

B. Lava slowly flowing out of a fracture in Earth's surface - This could potentially allow for the formation of a coarse-grained rock like dacite, as the slow flow of lava could provide enough time for larger crystals to form.

C. 25 km beneath Earth's surface - This would result in an intrusive rock, not an extrusive one, because the magma is cooling beneath the surface.

D. Within a zone of fractured rocks below Earth's surface - This would also result in an intrusive rock, as the magma is cooling beneath the surface.

So, the most likely condition under which a coarse-grained extrusive rock like dacite would form is option B: Lava slowly flowing out of a fracture in Earth's surface.