Density is not something that changes just because we're on earth. Density is a universal concept of how tightly packed the mass of an object is packed.
If you're trying to figure out why gravity is different from planet to planet, which is just caused by the speed of which the planet orbits the sun/object.
Air density is higher near the surface of the Earth. As you climb away from the surface, the pressure decreases.
The moon's average density is about the same as the density of mantle of the Earth.
No, the density of a sample does not depend on its location on Earth. Density is a physical property of a substance that remains constant regardless of its location. However, the gravitational force acting on an object can affect its weight, which may give the appearance of a change in density when in fact it remains the same.
Wind forms due to differences in air pressure, temperature, and density. Rotating storms, like tornadoes and hurricanes, form when warm, moist air near the surface rises and is replaced by cooler air. The rotation is caused by the Earth's rotation and dynamic pressure systems.
I believe that it is mainly caused by sunlight angles which reach different regions on Earth. Those sunlight angles may vary according to earth/sun positions while the Earth is rotating around the sun. Also the oceans cold water currents may cause a change in temperature.
Density does not change regardless of where the object is. It is a constant.
Salt
gets heavier
The deeper you get into the earth, the more weight you have above you. This results in pressure that increases the density of the material below.
yes
Erosion is something that causes the earth's landforms to change.
People can change the density of an object by altering its mass or its volume. Increasing the mass while keeping the volume constant will increase density, whereas increasing the volume while keeping the mass constant will decrease density.
Density does not change because density is measured by Mass/Volume. So whether you're on earth, on the moon or floating in space, your density remains the same. Pressure, on the other hand, changes because it is defined as force per unit area (Force/Area). Your weight is the force here. As you approach the earth, the value of g increases, and so does the value of force.
A change in the medium through which the waves are traveling, like a change in density or temperature, can cause wavelengths to change. Also, the Doppler effect can cause the perceived wavelengths of waves to change when the source of the waves is in motion relative to the observer.
erosion
Change of gravity pull
The change in seasons