9 continental mountains form when continental

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9. Continental mountains form when continental collisions occur (usually) but oceanic ridges form when upwelling of the mantle generates new oceanic crust. 10. Occurs along crests of oceanic ridges where hot mantle rock rises to replace material that has shifted horizontally. 11. Newly created oceanic lithosphere is hot and therefore less dense than cooler rocks of the deep-ocean basin. 12. Causes dark silicate in basalt to form new metamorphic minerals like chlorite. 13. Hydrothermal vents and hot springs. 14. Layer 1: unconsolidated sediments Layer 2: rock unit composed of basaltic lavas Layer 3: rocky layer made up of interconnected dike Layer 4: gabbro, coarse-grained equivalent of basalt. 15. Molten rock surges upward along numerous vertical fractures. Some cools and solidifies to form new dikes. 16. The city of Goma in the eastern Congo 17. Because the oceanic lithosphere is less dense that the asthenosphere, always. 18. It was subducting faster than it was being generated, remaining parts are the Juan de Fuca, Cocos, and Nazca plates. 19. is a geologic cycle where the Earth's continents alternatively merge into a single supercontinent, split into numerous continents, then merge again.
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Chapter 16- Review Christian Smith
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  • Spring '13
  • NguyenVanVuong
  • Plate Tectonics, Continent, Mid-ocean ridge, oceanic crust, oceanic lithosphere

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