| A | B |
|---|
| fossil | a whole or part of a plant or animal that has been preserved in sedimentary rock |
| friction | a force that opposes the relative motion of two material surfaces in contact with one another |
| fulcrum | the pivot point of a lever |
| galaxy | a large collection of stars |
| gas | one of the fundamental states of matter in which the molecules do not have a fixed volume or shape |
| gravitation | a force of attraction between two masses |
| gravity | the observed effect of the force of gravitation |
| habitat | a place in an ecosystem where an organism normally lives |
| heat | a form of energy resulting from the temperature difference between a system and its surroundings |
| herbivore | an animal that feeds on plants |
| igneous rock | a type of rock that forms from molten or partly molten material that cools and hardens |
| inclined plane | a type of simple machine; a slanted surface that makes it easier to move a mass from a lower point to a higher point |
| inertia | the property of a body |
| investigation | a procedure that is carried out in order to observe a response caused by a stimulus; not a complete experiment |
| kinetic energy | the energy possessed by a body because of its motion |
