Ultramafic rocks contain and are commonly found in . View Available Hint(s) Ultramafic rocks contain and are commonly found in . potassium feldspar; extrusive settings quartz; mantle plagioclase feldspar; extrusive settings amphiboles; intrusive settings olivine; mantle

Ultramafic rocks contain olivine and are commonly found in mantle.

Explanation:

Ultramafic rocks are a type of ignea rock that are found in the mantle. These rocks have a very low silica content, but have olivine and a high iron content. They are also low in potassium and sodium. The mantle is basically composed of this type of rocks, but they can be seen on the surface in the form of Ophiolitic complexes.

answers.com says temperate reagions

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)