Mid-Ocean Ridges
1. NOAA is The National Oceanic and Atmospheric Administration. A leader in exploring geological and biological mysteries of the deep-sea.
2. The mid-ocean ridge system is a 65,000 km long series of seafloor spreading centers where new Earth is created.
3. The mid-ocean ridge system is 65,000 km long 1,500 km wide. It is located near rift valleys.
4. The type of plate boundary that forms a mid-ocean ridge system is a divergent plate boundary because the oceans plates are torn apart.
5. Ridges form when tectonic activity pull and stretch part of the oceans crust, causing cracks along a narrow, linear, rift zone. As the plate thins, the underlying mantle begins to melt, and magma rises into the fracturing crust. Because the rift zone becomes less dense and more buoyant as it thins down and heats up, the crust rises to form a high ridge on the sea floor.
2. The mid-ocean ridge system is a 65,000 km long series of seafloor spreading centers where new Earth is created.
3. The mid-ocean ridge system is 65,000 km long 1,500 km wide. It is located near rift valleys.
4. The type of plate boundary that forms a mid-ocean ridge system is a divergent plate boundary because the oceans plates are torn apart.
5. Ridges form when tectonic activity pull and stretch part of the oceans crust, causing cracks along a narrow, linear, rift zone. As the plate thins, the underlying mantle begins to melt, and magma rises into the fracturing crust. Because the rift zone becomes less dense and more buoyant as it thins down and heats up, the crust rises to form a high ridge on the sea floor.
6. Basaltic dikes form most of the oceans crust.
7. Hot lava responds to cold sea water by the outer skin of the flow solidifies almost instantly while the interior remains molten and keeps moving. The inner turmoil distorts the surface of the basalt into irregular, lumpy pillows.
8. At Juan De Fuca Ridge divergence leads to volcanism that creates new oceanic crust, crust that is in its turn broken and pushed apart by continued divergence and volcanism.
7. Hot lava responds to cold sea water by the outer skin of the flow solidifies almost instantly while the interior remains molten and keeps moving. The inner turmoil distorts the surface of the basalt into irregular, lumpy pillows.
8. At Juan De Fuca Ridge divergence leads to volcanism that creates new oceanic crust, crust that is in its turn broken and pushed apart by continued divergence and volcanism.
9. The rate of spreading dictate no more than 1-3 cm per year while others spread at rates approaching 10-20 cm per year.
10. Sea water can be heated up to 400 degrees celcius.
11. Hydrothermal Vents are formed by
10. Sea water can be heated up to 400 degrees celcius.
11. Hydrothermal Vents are formed by