electromagnetic wave - these waves can travel without a medium, Electromagnetism - results when electric currents and magnetic fields interact with each other, evolution - the process by which populations change over time, extinction - occurs when all members of a species have died, F=ma - Newton's 2nd Law of motion, Force - a push or a pull, fossil record - provides evidence about the order in which species have existed through time, and how they have changed over time, frequency - tells how many cycles of a wave occurs in an amount of time, gravity - a force of attraction between objects that is due to their masses and the distance between them, igneous rock - type of rock that forms when magma or lava melts and cools and hardens to become solid, longitudinal wave - particles move back and forth in the same direction that the wave travels, magnetic field - the area surrounding a magnet where magnetic forces can be detected, mechanical wave - a wave that requires a medium through which to travel,

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