yes
Yes, wherever or whenever you have mass, you have gravity.
Gravity does not occur in mudslides. Gravity exists wherever there is mass.
Yes, there's gravity in a black hole.. gravitational force is exerted wherever there is mass.
To get the weight, multiply the mass by the acceleration of gravity wherever the mass happens to be at the moment. Dependoing on local acceleration of gravity, the weight changes from place to place.
I do not think that these countries exist because Gravity is everywhere. Wherever Gravity is a component, Relativity applies.
Gravity exists everywhere that mass exists, so the answer is yes.
Yes; wherever in the universe there is mass like planets, stars of even meteors, there is gravity.
Any object with mass has gravity, no matter how small. However, the strength of the gravitational force depends on the mass of the object - the more massive the object, the stronger the gravitational force it produces.
Gravity exists regardless of weight, as it is a force of attraction between objects with mass. Weight, on the other hand, is the force with which an object is pulled by gravity, and it depends on the mass of the object and the strength of the gravitational field it is in. So, gravity would still exist even if weight did not.
Mass is constant. You have the same amount of mass wherever you are in the Universe. Weight is the affect of gravity acting on your mass. So you weigh 1/6th as much on the Moon because there is less gravity there but you have the same amount of mass as you do on Earth.
No, an object's mass remains constant regardless of changes in gravity. Mass is an intrinsic property of an object and is not affected by the gravitational force acting on it. However, an object's weight, which is the force exerted by gravity on the object, will change with variations in gravitational pull.
Because your 'mass' is the amount of matter/stuff/substance/material that you're made of. Just like the amount of money in your pocket, the simple act of moving from one place to another doesn't have any effect on it.