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

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

Step-by-step 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.

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step-by-step explanation: