I have a shiny surface that reflects light. I can conduct electricity and heat. What am I?

Amixture with the same composition throughout is!

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.

What causes most sediment to wash or fall into a river