Sea-floor Spreading© Copyright NewPath Learning. All Rights Reserved. 94-4683Visit www.newpathlearning.com for Online Learning Resources.Mid-Ocean RidgesIn the middle of the Atlantic ocean is a submerged mountain range called a mid-ocean ridge. It is part of a worldwide system of mid-ocean ridges formed by . How Sea-Floor Spreading Occurs occurs when two tectonic plates pull away from each other, and a crack forms Magma from the Earth’s mantle pours onto the creates new oceanic crust.Mid-Atlanticridgecontinentalcrustoceaniccrustmagmatectonic platetectonic plateoceanNew & Old Oceanic CrustA mid-ocean ridge is formed along the crack where magmaoceanic crust pushes the older crust away from the ridge.magmaocean floorerupting magma (lava)oldercrustoldercrustyounger crustmagmaocean floorerupting magma (lava)North American PlatePacific PlateEurasian PlateArabian PlateAfrican PlateSouth American PlatePacific OceanAtlantic OceanNazcaPlateCocosPlateOceOcOOOcO1 cm1 cmMid-AtlanticRidge is part of the Plate Tectonics theory. In the Atlantic, the plates move away from the mid-ocean ridge at a rate of about one centimeter per yearcrust is changing and moving the continents as well.Ocean Ridge SystemMid-Atlantic ridgeocean ridgesIn the middle of the Atlantic ocean is a submerged mountain range called a mid-ocean ridge. It is part of a worldwide system of mid-ocean ridges formed by . occurs when tttttttttttttwwwwo tectonic plates pull away from each other, and a crack forms rMagma from tttttttthe Earth’s mantle pours onto the creates new oceanic crust.ccccccontinnnnnnnnnnnneeeeeeeeeeeeeeeeennnnnnnnnnnnttaaaaaaaaaaaalllllllllllcrrrrrrrrrrrrruuuuuuuuuuuuuuusssssssstttttttttttttttoceaniccrustmagggggggggmmmmmmmmmmmmmaaaaaaaaaaaaattttttttttttttttteeeeeeeeeeeeeecccccccccccccccttttttttttttttooooooooooooooonnnnnnnnnnnnic platetectonic plateoceaaaaaaaannnnnnnnnnnnnA mid-ocean ridge is forrrrrrrrrrrrmmmmmmmmmmmmmedddddddd alooooooooooonnnnnnnnnnnnnggggggggggggggggggggg tttttttttttthhhhhhhhhhhhhhhheeeeeeeeeeeeeee cccccccccccrrrrrrrraaaaaaaaaaaccccccccckkkkkkkkkkk whhhhhhere maaaggggggggggggggggggggmmmmmmmmmmmmmmmmmmmmmaaaaaaaaaaaaoceanic crustpushes the older crust awwwwwwwwwwwwaaaaaaaaaaaaaayyyyyyyyyyyyyyyyyyyyy ffrommmmmmmmmmmmmmmmmmmmm tttttttttttttthhhhhhhhhhhe ridge.mmmmmmmmmmmmaaaaaaaaaaaaaaaagggggggggggggggmaocean flooran flooran floorocean floorocean floorerrrrrrrrruuuuuuuuuuuupppppppppppppppppppttttttttinnngggggggggggg mmmmmmmmmmmmmmagma (laavvvvvvvvvvvvaaaaaaaaaaaa))))))))))))))ooooooooooooooooooollllllllllllddddddddddddddddddddddddddddeeeeerdddeeeeeeerrrrrrrrrrrrrrcccccccccccccccccccccrrrrrrrrrrrrrrrrrtttttttttttussssssssssssssssttttttttttttttttttttccccrrrrrrrruuuuuuuuuuuuusssssssssssteroooooooooooooooooooooooooooolllllllldllderstcrcrusustooooooour ccrrruuuuuuuuuuuuuuuuuuuuuuuuuusssssssssssssssssssssttssssstttttttttttttggggggggggggggerunnnnnnnnnnnnnnngggggggggggggooooooooouuuuuuuuuuuuuuuuuuuunnnnnnyyyyyyyyyyyyyyyyyyyooooooooooooouyermagmaoccccceeeeeeaaaaaaaaaaaannn flflflflflflflflflflflflflflflflflflflflflfloooooooooooooooooooorrrrrrrrrroceeeeeeeeeeeaaaaaannnnnnnnnnn flflflflflflflflflfloooooooooooooooooooooooooooooooooroceaaaaann flflflooooooooooorflflflflflflflerrrrrrrrruuuuuuuuuuupppppppppppppppppttttttttttttiiiiiinnnnnnnnnnngggggggggggggg mmmmmmmmmmmmaagggggggggggggggggmmmmmmmmmmmmmma (lava)merican PlateNorth American PlaPacific PlateEurasian Plau sian PlateArabianPlatePla ePAfrican Platerican South AmeriPlatePacific OceanOceanceanOceancOAtlantic OAtlantic OcaaOOOaa ttttnnnn iillAAaaaaAAAANazcaPlateCocosPlateOOOOOOOccOcOccOOcccOcOcOOOOccccOOOOOcOOOOO1 cm1 cmMid-AtlanticticRidgege is part of the Plate Tectonics theory. In the Atlantic, the plates move away from the mid-ocean ridge at a rate of about one centimeter per yearcrust is changing and moving the continents as well.Ocean Ridge SystemMid-Atlantic ridgeoceannnnnn rrrrrrrrrrriiiiiiiiiiiiiddddddddddddddddggggggggggggggeeeeeeeeeesssssssssssssssss
< Page 8 | Page 10 >