the moon is approximately 27% the size of the earth, but you would need 81 objects with the mass of the moon to match the mass of the earth. How is this possible when the moon was created by a collision between earth and a mars sized object 4/5 billion years ago?

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

answer; cnidarians;

answer; synapse;