Gravity is a force between any two masses.
Yes.
No. Mass (e.g. grams) is a measure of matter, and is independent of gravity. Weight (e.g. pounds) is a measure of force and is directly related to gravity.
Sorry, but earth is not a gravity free system. No matter where it is placed in the universe it will still have gravity that will affect all around it and that upon it.
Any two objects attract one another.
Gravity is NOT matter, it is a force that effects matter.
The most important effect of gravity in hockey is that it keeps the ball on or close to the ground. For that matter it also keeps the players on the ground.
The Moon has only about 17% of earths gravity. that means the average man will weigh about 12 kilo, if you drop a stone it will fall to the ground but slowly.
Matter causes gravity in the first place.
If by solidity is meant density then yes - the denser is the matter the object is made of, the more matter there is in a cube of its volume, the more its mass, so the more its gravity. The gravity of two objects towards each other is proportional to their masses and inversely proportional to the distance between them.
In theory an earthquake moves enough matter quickly enough to create a gravity wave, but in practice, that gravity wave is much too weak for us to detect at our present level of technology.
Does gravity affect a person's height and why?
Gravity is produced by all matter, including that of Earth.