The Earth's is what gives us day and night

1. Orbit
2. Rotation
3.Revolution

2nd option, Rotation

I hope this helps, and Stay Safe! :)

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )