Answer:
At almost the opposite point on the Earth's surface, the "P" waves reappear. The shadow zone exists because the waves are refracted as they pass through the boundary between the mantle and the core and are diverted from their original paths.
Covalent Bonds hold together atoms within a molecule
B, Gases. The gases create an insulation around the planet so it keeps in heat from heat sources.
Plasma, water, salt, protein, platelets
