17. The choose the answer that is correct about the Earth's mantle. made of magnesium, iron, and calcium

made of rocky materials and water

made of the same rocky materials as the crust

made mostly of iron and nickel

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive