QUESTIONS Ocean Basins and Continental Margins is responsible for the positionin
ID: 289669 • Letter: Q
Question
QUESTIONS Ocean Basins and Continental Margins is responsible for the positioning of consinents and ocean bosims toky, and throughout geologie time? Use Figure 13.6 to answer this question. cifie Ocean the deepest ocean compared to the Atantlencs of 2. to the Atlantic Ocean and Indian Ocean? URASIAN PLATE RATE PLATE il NAZCA PLATE NTARCTIC PLATE Rigure 13.6 Lithospheric plates, plate boundaries, and volcanic centers From Vocanes Ae Introduction by l Scath Crih194 e Uhiversity Press Reprinted by permission If available, use of the following maps: Physiograpbic Chart of the Sea Floor Hubbard Scientific), World Occan Floors: Pacific Ocan and Atlantic Occan, and Earth's Fractured Surface (National Geographic Society) in conjunction with Figures 13,5 and 13.6 for the next set of questions will enhance a visual by show- understanding of the effect of plate tectonics on continental margins. Supplement these maps ing physiographic and tectonic features on Google Earth if computers and the Internet are available. 3. Compare the width of the continental shelves along the eastern margin and western margin of North America and South America. Along which margin, east or west a. do you see the widest continental shelf? do you see the narrowest continental shelf 134 Laboratory 13: The Caast: Proceses and HazarExplanation / Answer
1)plate tectonics/ movement of lithosphere driven by the mantle convection current.
the mantle convectively flows at the rate of several centimeters a year, and this drag the upper lithosphere and this causes the plates/continents to separate apart in millions of years.
2)subduction zone.
the Pacific Plate, is subducted beneath the smaller Mariana Plate that lies to the west and formed the Mariana trench, deepest part of the world's ocean with a depth of 11,034 meter. pacific plate is one of the oldest oceanic crust on the earth and therefore its cooler and denser which causes it to subduct beneath the younger mariana plate.
3) a) east coast or atlantic coast of North America and South America is wide and shallow shelf. atlantic coast is a passive continental margin and made of thick sedimentary wedges derived from long erosion of a neighboring continent.
(b) pacific coast or the western coast is narrow continental shelf. western coast of North America and South America are active margins which have narrow, relatively steep shelves, due to frequent earthquakes that move sediment to the deep sea.