Rivers move a lot of rock when they move quickly because they have a lot of

All forces cause motion? true or false

Which statement best describes what happens when molecular compounds melt

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?