Question

**Fill in the blanks**

Answer 1

Answer:

1. Gravity

2. Matter

Explanation:

According to Giant impact theory, when a Mars sized object collide with the Earth, the debris was held close to Earth due to its gravity. The debris collided frequently forming a planetesimal which grew in size overtime. Thereby, the gravity increased and pulled even more matter. The accretion of this matter eventually formed the Moon.

Answer 2

Answer:

Word for the first blank: gravity

Word for the second blank: matter

Explanation:

The only way debris from the impact with Earth can be held close to Earth is due to a force. The only force that could be acting from Earth is "the force of gravity".

The gravitational pull of this new object being formed, increases proportional to its mass as more and more "matter" accumulates. And the accretion process is now on its way.