The dirt forms a visible dust cloud near the ground. In some cases this dirt cloud can sometimes extend all the way up to cloud base and completely obscure the condensation funnel.
Debris.
Nowhere in particular. If a tornado picks you up (which actually doesn't happen as often as many people think) it will just carry you some distance before dropping you back down.
Have you ever seen a great big rock flying through the air in the wind? Not unless it's a tornado. Wind does not pick up big rocks. It picks up sand and dirt and other tiny stuff and leaves the big stuff behind.
Tornadoes pick up dust and many other materials. The other materials that a tornado is capable of picking up include trees, power poles, the roofs off of houses, and entire mobile homes.
A tornado originates from a mesocyclone, a circulation a few miles wide found in some thunderstorms. Under the right conditions a downdraft can warp around a portion of the mesocyclone, causing it to tighten and elongate. The elongation brings it to the ground while the tightening causes it to intensify.
The debris will be dropped wherever the tornado looses the power to hold it.
Partially. The color of a tornado can be affected by the color of the dirt it picks up as well as how it is lit. The funnel of a tornado is condensation just like in ordinary clouds and may appear black, gray, or white depending on how it is lit. The soil of an area can color a tornado as well if enough of it is lifted into the air, but lighting still remains a factor even when dirt completely obscures the funnel. A tornado will appear lighter when lit from the front than when lit from behind.
Anything that it picks up.
a machine
It destroys everything in its path. Besides, anything debris the tornado picks up is a deadly missile.
Debris.
It has happened on a few occasions. But generally your chances of survival are low if such a strong tornado picks you up.
Technically it never really rains frogs, but this happens when a tornado happens to go through a marsh or swamp, picks up some frogs, and drops them sometimes even miles away from the place where they were taken.
magic
people call in and tell them or a radar picks up the approaching tornado
If you mean to say to tornadoes take away everything they touch, no. Some stuff they leave in place depending on how strong the tornado is. If you mean to ask if everything a tornado picks up stays with the tornado or ends up back where it started, then the answer is neither. When a tornado picks something up it will stay airborne for a bit but will eventually fall back down somewhere else or end up stuck in something such as a tree or a wall.
It picks up oxygen