The dominant constituent of ultramafic rocks in earth's mantle is

It should be B- Olivine

Peridotite is ultramafic, as the rock contains less than 45% silica. Peridotite Olivine higher and pyroxene also present. It is high in magnesium (Mg2+), reflecting the high pr...

Olivine is the dominant constituent of ultramafic rocks in Earth's Mantle. Olivine is stable in high pressure and temperature condition and hence remain stable and dominant in Mant...