Ocean Topography

Ocean Topography

1. Different Parts

   • Continental Shelf
     • underwater extended perimeter of the con.
     • Teaming with life
   • Oceanic Trench
     • Subduction Zone
     • deepest part of the ocean
     • Marianas Trench - 7 miles deep
   • Continental Rise
     • In b/w the slop and abyssal plain
     • "Underwater Hill"
   • Continental Slope
     • Steep slope from the shelf to the con. rise
     • Connects the continet to the ocean floor
     • "Drop Off"
   • Abyssal Plain
     • depth of 6,600 - 20,000 feet
     • covers most of the ocean floor
     • Very high pressure
     • average tempature is 39 F

2. Crust

   • Oceanic Crust
     • Density = 3.0 g/cm^3
     • 5 km thick
     • Constantly forming
   • Continental Crust
     • Density = 2.7 g/cm^3
     • 20-50 km thick
     • Very old

3. Plate Tectonics

   • Seafloor changing
     • Divergent Boundaries
       • magma pushes to pieces away from eachother, solidies and creates new oceanic crust
     • Continental Boundaries
       • Deep trench forms, when a oceanic plate moves under the continental plate
         • creates volcanoes or mountains
           • the top rises above the sea and creates an island
   • Landfloor changing
     • Con-Con Plates
       • the two continental plates hit eachother they form mountains on land

Bilder und Dateien der Mindmap