Tangischools 8th Grade Science Unit 2 Chapter 7 Lesson 1 & 2
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10 terms
Terms | Definitions |
|---|---|
 continental drift | hypothesis that continents are in constant motion |
| fossil | naturally preserved remains, imprints, or traces of organisms |
| mantle | middle layer of Earth situated between the crust above and the core below |
| Pangaea | ancient supercontinent, composed of land that forms today's continents |
| magnetic reversal | event in which the magnetic field reverses direction |
| mid-ocean ridge | mountain range located on the seafloor in the middle of the ocean |
| normal | conforming to a type, standard, or regular pattern |
| normal polarity | today's magnetic field; magnets orient themselves to point north |
| reversed polarity | magnetic field in which magnets orient themselves to point south |
| seafloor spreading | new oceanic crust forms at a mid-ocean ridge as old oceanic crust moves away |
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