Question

scientists know that the mantle is made of the rock peridotite because a of evidence from seismic waves, heat flow and meteorites b it is commonly seen at earths surface c it is ultrafelsic, which fits the density of the mantle d all of the above

Explanation:

• Option b: Peridotite is not commonly seen at Earth's surface. It is usually found in the mantle and in some deep - seated igneous rocks but not widespread on the surface.
• Option c: Peridotite is ultramafic (rich in magnesium and iron - containing minerals), not ultrafelsic (which would be rich in silica).
• Option a: Scientists use evidence from seismic waves (which show how waves travel through different materials in the Earth, giving clues about the composition), heat flow (related to the thermal properties of the mantle materials), and meteorites (some meteorites are thought to be similar in composition to the Earth's mantle).

Answer:

A. Of evidence from seismic waves, heat flow and meteorites