Which of the following causes tornadoes
1. cool, dry air meeting warm , moist air
2. cool, moist air meeting warm ,dry air
3. typhoons losing energy over land
4. eastern air meeting western air

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

there is none because earth is stationary and flat.