By a force called gravity
The earth's gravitational pull.
Gravity
It is kept in orbit by Earth's gravity.
yes it is.
The earth's orbit around the sun is not round. The satellite's orbit kept it at a fixed altiitude above earth.
The planets are kept in orbit by the Suns gravity.
The Moon is kept in orbit around the Earth due to a balance between its inertia (which tends to make it move in a straight line) and the gravitational pull of the Earth (which keeps it in a curved orbit). This gravitational force constantly pulls the Moon towards the Earth, keeping it in its orbit.
The earth by its gravitational pull keeps the moon in its orbit. The earths gravitational pull and the Moon's inertia creates a force called the centripetal force which keeps the Moon in orbit.
The moon does not revolve around the sun. The moon revolves around the Earth though! kept in orbit by the earth's gravitational pull.
An earth orbit that is lower to earth then both a medium and high earth orbit.
The moon will probably never be destroyed by the Earth's gravitational attraction because it is in a stable orbit. Its orbit is kept stable by its high velocity, therefore the only way Earth's gravitational attraction could pull the moon out of its orbit and towards the Earth is if its course is changed or it is slowed down tremendously, perhaps by a large impact such as a meteor.
The planets do not orbit the Earth, they orbit the sun.