Question

multiple choice question in general, what is true of rocks? o rocks that are rich in silicon melt at higher temperatures than rocks that contain higher levels of iron and magnesium. o rocks that are rich in iron and magnesium melt at lower temperatures than rocks that contain higher levels of silicon. o rocks that are rich in iron and magnesium melt at higher temperatures than rocks that contain higher levels of silicon.

Explanation:

Rocks rich in iron and magnesium (mafic rocks) have lower melting points than silicon - rich (felsic) rocks. So the correct statement is that rocks rich in iron and magnesium melt at lower temperatures than rocks with higher silicon levels.

Answer:

B. Rocks that are rich in iron and magnesium melt at lower temperatures than rocks that contain higher levels of silicon (assuming the middle option is B as per typical multiple - choice numbering, with the first as A, middle as B, third as C)