The answer should be a, repeat the the results many times.
Answer:
The Nebular Theory of the origin of the Solar System
Explanation:
Solar system formed about 4.6 billion year ago, when gravity pulled together ... The solar nebula became hottest near the center where much of the mass was ... The disk was so spread out that gravity was not strong enough to pull material and form planets.
Answer:
because the vegetation has been modified by human action
Explanation:
Plowing removed the grass and exposed the soil to wind erosion
Gravity and earths rotation