Rare earth metals are a group of 17 elements - lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground
1. Rubber band: elastic potential energy
2. Spring: elastic potential energy
3. Roller coaster: gravitational potential energy
4. Rabbit: chemical potential energy
5. Hamburger: chemical potential energy
Many organisms need clean drinking water and we also need moisture in the air for us to stay hydrated
