Silicon, it's bring brother would be the prime candidate, although its compounds are notably different from those of carbon.
A cloud that forms on the ground is called fog. Some clouds you see in the sky might be from airplanes. These are called contrails. High level cirrus clouds may travel at speeds up to 100 mph.
Because they're not confident enough to confirm it's indeed true but they will support it for they believe it's correct.
Change in velocity over time is acceleration.
You're finding acceleration .
