Yes. Gravity exists everywhere. Within 200 km of its surface, Earth is the dominant gravitational body.
No. Earth's gravity is a result of its mass. Every bit of mater on and within Earth contributes to its gravity.
Partially. Every bit of mass on and within Earth contributes to its gravity.
The Earth. Actually, technically, the Moon and Earth revolve around a common center of gravity, but that center of gravity falls within the earth itself.
within 200km from the American border
200km = 20,000,000cm
Yes, anything that get's within a close range of the earth will be pulled on by earth's gravity.
It's all about gravity. The moon and earth each orbit around the 'barycenter', the center of gravity of the earth-moon system. this point is within the body of earth itself.
No. Gravity is not a substance. It is an attractive force between objects with mass.
Jupiter and Neptune are the only planets in our Solar System that have more gravity than the Earth. Jupiter's gravity is about 236% that of the Earth, and Neptune's gravity is about 112% that of the Earth. Edit: Because of uncertainties and different definitions you can get data that says Saturn and/or Uranus also have slightly stronger gravity than Earth's.
No. The earth has its own gravity. The lunar gravity causes tides on earth, but does not control earth's gravity.
Gravity keeps 99 percent of the total mass of the atmosphere within 32 km of Earth's surface. This force prevents the gases in the atmosphere from escaping into space and holds them close to the Earth's surface.
200 km