amplitude - a measure of how far the particles in the medium move away from their normal rest position, analog signal - a continuous wave that may vary in strength or frequency, artificial selection - the process of selecting and breeding organisms that have certain desired traits, Balance Force - forces that are opposite in direction and equal in size, Big Bang Theory - states that the universe began with a tremendous expansion 13-15 billion years ago, Common Ancestry - similarities/differences in internal structures support evidence of this, convection current - causes tectonic plates to move, convergent boundaries - form where two plates collide. 3 types; continental-continental, forms mountains, continental-oceanic, oceanic-oceanic, forms volcanoes from the subduction, digital signal - carries individual bits of information in separate units of time, divergent boundaries - two plates move away from each other, forms new sea floors, 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,

8 Grade -- ELA -- 6

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