cross section of planet earth showing the lower mantle, made by olivine, pyroxene and feldspar. temperature 1800 - 2800ãƒæ’ã¢â‚¬å¡ãƒâ€šã‚â¡ celsius. - pyroxene stock illustrationsCross section of planet Earth showing the lower mantle, made by olivine, pyroxene and feldspar. Temperature 1800 - 2800¡ Celsius.