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AMS 17.1 & 17.2

TermDefinition
Continental Drift Alfred Wegener’s theory that proposed that Earth’s continents had once been joined as a single landmass that broke apart and sent the continents adrift.
Pangaea The name Alfred Wegener gave to the supercontinent he believed existed when all the continents were joined together.
Magnetometer A device that can detect small changes in magnetic fields.
Magnetic field The portion of space near a magnetic body, or a body carrying an electric current, within which magnetic forces, due to the body or current, can be detected
Magnetic reversal When the flow of molten iron in the outer core changes resulting in Earth’s magnetic field changing direction.
Paleomagnetism The study of the history of Earth’s magnetic field.
SONAR A machine used by scientists to send a signal to the ocean floor, timing how long it takes for the sound to reach the bottom and return to the surface as an echo (Sound Navigation and Ranging).
Topography Variations in elevation of the crust.
Ocean ridge Vast underwater mountain chains that run along the Earth’s ocean floor like seams on a baseball.
Deep-sea trench A narrow, elongated depression on the seafloor.
Isochron A map of imaginary lines on the ocean floor connecting areas of the same age.
Seafloor spreading The theory that states that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches.
Symmetry an exact matching of form on opposite sides of a boundary
Misconception an incorrect understanding or idea
Technological (adjective) describes the use of scientific knowledge, methods, and materials to solve problems
Elongated long and thin or narrow, extended
Depression an area sunken below its surroundings
Counterpart a thing which, when added to another, completes or complements it
Deposition the laying down of matter by a natural process
Polarity condition of being aligned with magnetic poles
mya million years ago
Intrusion forcing the way into an area
Cycle a repeated sequence of events
Descends To move from a higher to a lower place or position.
Created by: ArmstrongSci8
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