No, the earth is round as far as I know
They do fall. But they're traveling fast enough so that the surface of the Earth falls away from them as fast as they are falling. Same thing that keeps the Earth from falling into the sun.
It is a projectile falling with an acceleration equal to that of free fall. (an object falling in a vacuum at the earth's surface)
It relies on falling water. Water will always fall in certain parts of the planet forever.
In a sense they are continually falling to Earth, but they are so far away that the curve of their fall is big enough to follow the circumference of the Earth.
Things usually fall as a result of Earth's gravitational attraction.
The earth is falling. It takes the earth an entire year to fall once around the sun.
They are falling but their horizontal motion means that their fall and the curvature of the Earth match so the continually miss the Earth.
Gravity.
They don't fall because they're travelling too fast to fall. An orbit is technically a fall. An object orbits when it falls at the same rate as its forward movement, so while it's falling toward the earth, the earth is falling away from it below.
Actually they do fall to the earth. Clouds are drops of water and when it rains, snow, hails, or if there is any sleet it is cloud falling through the ground.
The Earth itself is in free-fall, falling around the Sun in its orbit. Asteroids behave the same way; they are falling in their orbits around the Sun. Sometimes, they collide, like cars on the freeway.
There's nothing special about it; they are just falling rocks. Of course, they are rocks that fall FROM SPACE, and the Earth is just sort of "in the way" as the rocks are falling around the Sun.