Chemicals ~ everything on earth is made up of the 103 known chemical elements, including rocks, mineral, air, water, plants & animals

Crystals ~ minerals that form slowly have a distinctive crystal shape

Earth's Crust ~ the earth's crust is made of solid, hardened rocks & minerals

Gemstones ~ rocks & minerals that have been cut & polished, used for decoration and are usually rare and valuable

Rocks ~ rocks are made of 2 or more minerals

Rock Cycle ~ rocks are constantly forming, wearing down and forming again, very slowly however

Minerals ~ all rocks are made of one or more of the 3000 known minerals