Scientists classify rocks into three different types. what is the main basis for the classification system they chose?

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

How are the terms group and period used on the periodic table