Friction		The rate at which a moving object changes position
Velocity		The study of the earth’s atmosphere
Motion		A large section of the Earth’s crust that slowly moves
Acceleration		A pattern of weather in an area measured over a long period of time
Momentum		The process that occurs when two substances combine to form another substance
Gravity		An instrument to measure the force and duration of earthquakes
Acid		The basic structural unit of living things
Base		Molten (hot liquid) rock under the Earth’s surface
Compound		A mixture where one substance dissolves into another
Protons, Neutrons and Electrons		A chemical or food that provides what is needed for plants or animals to live and grow
Solution		The part of a cell that contains genetic information telling it what to do
Chemical Reaction		A pure substance made up of two or more elements
Cell		A substance with a pH of less than 7
Nucleus		Caused by vibrations in the earth
DNA		Parts of an atom
Microscopic		The middle part of a cell that often holds the DNA
Nutrient		The speed at which something moves
Microorganisms		Movement
Seismic		Tiny living things that can only be seen through a microscope
Climate		A force which tries to pull two objects together
Meteorology		A substance with a pH of more than 7
Seismograph		The force that an object has when it’s moving
Magma		Too tiny to be seen with your eyes alone
Tectonic Plate		A force that holds back the movement of a sliding object