This is because elements are pure substances with only one atom. When two or more elements are combined, you get compound elements; which allows for more substances to be created.
Airborne is the most common.
<span>The place where two bones meet and allow our skeletons to be more flexible is known as a Joint.</span>
Passive diffusion is a form of passive transport and a type of diffusion by which particles from a high concentration gradient passes through a biological membrane to a low concentration gradient. Diffusion, or simple diffusion on the other hand, is the passage of molecules without the need of a membrane.
Quickly... this is a harder one, because all of possible answers are the result of interactions over a long time. However, these change the surface of the earth the fastest
1.) Volcanoes
2.) Flooding
Over a long time
1.) Through the rock cycle... earthquakes, mountain forming, etc.
2.) Melting, or forming of ice... changes sea levels
