No. The highest number of tornadoes ever recorded in a single day was just over 200. The exact number of tornadoes that occur worldwide is unknown, but it is unlikely that it is more than a few thousand per year.
Yes. It is fairly common for hurricanes to produce tornadoes.
Many tornadoes have a structure similar to the eye of a hurricane, but the only true eyes are in tropical cyclones. In Tornadoes and other storms it is called a weak echo region.
True, lava is molten rock that has reached the Earth's surface, while magma is molten rock beneath the Earth's surface.
It is not true.
True north runs from any point on the earths surface to the North Pole.
True. Doppler radar can detect tornadoes.
Tornadoes follow a predictable pattern of formation and dissipation.
It has recently been found that there are vortices on the sun that superficially resemble tornadoes, but they are not true tornadoes.
True
True
Tornadoes occur in other countries besides the US. However, the US heartland has ideal conditions for tornadoes.
True.
Of course tornadoes have been seen. They're not invisible. in fact, they're huge. You can see videos of tornadoes if you do a YouTube search.
That is the most common direction in which tornadoes travel, but they can move in any direction.
False. Tornadoes are very common in Texas.
No. There are enormous, magnetically-driven vortices of plasma on the sun that have been compared to tornadoes. However, these are not true tornadoes as they operate on entirely different mechanics.
False. Tornadoes can occur almost anywhere; Tornado Alley is just where strong tornadoes are most common.