Why do all the planets follow the same orbital path?

It's thought to have arisen from an amorphous cloud of gas and dust in space. The original cloud was spinning, and this spin caused it to flatten out into a disk shape. The sun and planets are believed to have formed out of this disk, which is why, today, the planets still orbit in a single plane around our sun

Explanation:

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answer; gravity pulls glaciers down hill and as glaciers flow it pick up rocks and soil;