What was the significance of collisions of dust, rock, and ice during earth’s formation?
a. to modify the density of materials present on earth
b. to facilitate heat absorption from the surrounding space
c. to blow away a strong burst of particles from the first atmosphere
d. to harden materials to form different parts of earth’s layers

A. to modify the density of materials present on Earth

Explanation:

The significance of the collision of dust, ice and the rocks and other matter with the earth was to change and modify the climate and density of the matter present on the earth. As this collision creates massive changes in the earth geologic formations and lithosphere and owning to this collision has led to what is knows as the present earth's characteristics.

Reproduction i think