Question

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

Answer 1

To modify the density of materials present on earth ( A )

Explanation:

The collisions of dust, rock and ice causes the modification of the density of materials present on earth, this collision caused the temperature of the earth to rise very high and therefore causing the the earth to melt under such high temperature.

The parts of the earth that was denser than the others after the melting settled down and formed the earth's core while the less denser materials formed the crust of the earth. all the process contributed in the formation of the earth.

Answer 2

The correct answer is A: to modify the density of materials present on earth.

Explanation:

In the early Earth, the collisions between dust, rock and ice created heat energy and raised Earth's temperature, which changed the density of materials present (because density of materials depends on temperature). and this change in density then caused the densest materials to sink to the core, and the lightest to rise to the surface, creating Earth's layers.

So we see here that the collisions of dust, rock and ice was most significant in modifying the density of materials on Earth. Therefore choice A is correct.

P.S: Choice D is tempting but not correct because the collisions of rock, dust and ice did not directly caused Earth's layers to form.