In a physical change, like changing state from a solid to a liquid, the substance itself doesn't change. How is a chemical change different from a physical change?

If animal agriculture was eliminated, how much grain would become available for human consumption?

What are the proteins in connectivity tissues of your foot examples of?

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.