Why is there so little evidence of the period of heavy bombardment on earth?

a. earth's magnetic field prevented asteroids from striking earth.

b. the moon's gravity prevented asteroids from reaching earth.

c. weathering, plate movements and volcanoes destroyed many of
the craters.

d. asteroids burn up in earth's thick atmosphere.

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?