Having trouble with these questions 12. The presence of water d. All of the abov

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Having trouble with these questions

12. The presence of water d. All of the above. a. lowers the melting temperature during flux melting. b. helps the magma rise toward the surface. c. causes explosive volcanic eruptions. d. All of the above. 6. Glassy igneous rocks a. form deep within the Earth. b. form by slow cooling. c. have no minerals. d. cut across layering in the surrounding rocks. 13. Intermediate igneous rocks (andesite and diorite are found most commonly a. at mid-ocean ridges. b. at subduction zones. c. at transform faults. d. At all of the above plate boundaries. t likely formed wher magma cooled a. deep within the Earth. b. at two different rates

Explanation / Answer

6) Glassy igneous rocks

Ans. c. have no minerals.

Glassy igneous rocks formed by the rapid cooling. As a result crystallization cannot occur. So glassy igneous rocks having few or no crystals.

7) A fine-graied texture most likely formed when a magma cooled

Ans. All options are not given here. The answer is close to the earth surface.

12) The presence of water

Ans. d. all of the above.

Because these all happened due to the presence of water.

13) Intermediate igneous rocks (andesite and diorite) are found most commonly

Ans. b. at subduction zones.

They are formed by the partial melting of oceanic crust at the subduction zones.

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