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Marine Provinces (Mid-Ocean Ridge (Features (Oceanic ridge, Central rift…

- - - - Convergent Margin: narrow shelf, steep continental slope, trench (no rise), earthquakes/volcanoes
      - Transform Margin: lots of shore features, continental borderland, linear islands, banks, deep basins close to shore
      - Less common, only earthquakes NOT volcanoes
      - Transition to oceanic crust/continental slope far from shore
- - - - Underwater volcano more than 1000m (.6mi) tall
      - Active or extinct
      - Many many seamounts still to be discovered
      - Approximate locations are known from satellite or actually going to study them
      - Create their own ecosystems with shallow-water habitat
      - Ecosystems lead to the development of fringing coral reef
      - As the seamount becomes inactive, an atoll and lagoon forms
    - - Hotspot volcano created by mantle plume
      - Leaves track of seamounts that show how plate motion has changed over time
    - - In convergent active margins: the continental slope descends into deep oceanic trenches
      - Landward side of a trench rises as a volcanic arc