It varies widely depending on where you are relative to the tornado, how much rain and haze is in the area, and what else may be blocking you view. In good visibility a tornado may be visible from over 10 miles away. In the worst cases a tornado obscured by rain may not be visible until it actually hits you.
A tornado may appear pink if it is lit up by the setting or rising sun. Note that you are far more likely to see a tornado at sunset than at sunrise.
If you can see the tornado
No. If there is a tornado the sky will be over cast an you won't be able to see the moon.
In a tornado, you may see debris swirling around, giving the appearance of seeing air. What you are likely seeing is the dust, dirt, and other particles that are picked up and carried around by the strong winds of a tornado. The air itself is not visible, but the debris it carries can make it appear so.
Before a tornado, you may see dark, low-lying clouds with a greenish tint, known as wall clouds or shelf clouds. These can be associated with severe weather and serve as a warning sign for potential tornado activity. Additionally, you may observe ominous rotating clouds or a funnel cloud forming, which can indicate an imminent tornado.
A tornado may appear pink if it is lit up by the setting or rising sun. Note that you are far more likely to see a tornado at sunset than at sunrise.
The hardest tornado was in Texas, USA.
It is difficult to tell for certain. You may be able to eyball the distance if you can see it clearly, but that is not reliable enough to stake your personal safety on. Tornado warning will often call out the location of a tornado relative to one or two communities, which gives an idea of how far away a tornado might be. However, a warning can be several minutes old by the time you read it, which is enough time for a tornado to move a few miles.
If you can see the tornado
Yes. There are hundreds of tornado videos on YouTube.
It is safest to stay underground if you hear/see a tornado.
The average tornado lasts about 10 minutes and travels about 5 miles.
It isn't. An earthquake releases far more energy than a tornado.
A cyclone is bigger than a tornado by far, but a tornado is usually more violent.
You would be far more likely to see a tornado in Kansas. Kansas as the highest number of tornadoes per square mile of any US state.
When you see a tornado, go into a secure building or if there are none near you, huddle in a nearby ditch.
The Joplin tornado traveled about 22 miles in total. It was in Joplin for about 7 miles.