Continental Margins and Ocean Basins
Trieste
1. _________________________: Don Walsh and Jacques Picard
reach the ___________________ in the Marianis trench. It is
________________ deep.
2. This is more hazardous than visiting _________________.
Bathymetry
1. Why is it difficult to map the Earth?
2. What is bathymetry?
3. How is this done? (next 2 slides)
Topography of the Ocean Floor
1. What is the continental margin?
2. What is the ocean basin?
3. Types of continental margins
a. Passive:
b. Active:
4. Continental Shelf
a. Definition:
b. Type of crust
c. What types of features do we find there?
d. ______ of the ocean area
5. Continental Slope
a. ___________________ between c. shelf and deep ocean
floor.
b. Formed of ______________ that reach the
_____________ edge of the shelf and are transported
_________________.
c. Average slope =
d. _____________ is the TRUE edge of the continent.
6. Shelf break
a. Abrupt transition between ________________________.
b. Depth of water =
7. Submarine Canyons
a. Cut into the shelf and slope, ending on the _____________
in a _______________wedge of sediment.
b. ________________, landslides, and _____________ will
create _________________________.
8. Continental Rise
a. Along _____________ margins ONLY.
b. Base of ________________ is a blanket of
__________________________.
c. Shaped by _______________________ currents.
9. Deep Ocean Basins
a. Sediment up to __________ thick (___ miles!)
b. Makes up more than ____________ of Earth’s surface.
10. Oceanic Ridges
a. If you drained the ___________________, these would be
the most remarkable features.
b. _____________________ chain of ____________ rock
along the active spreading center of an ____________.
c. _____________ above the sea floor.
d. Can project above the _______________ to form
________________. Name an example.
11. Hydrothermal Vents
a. _________________ on the ocean floor.
b. Discovered in _______________.
c. Dark, ___________________ water at _______ forces
out of the bottom of the ocean.
d. Also called “________________________”.
e. May be very common, especially in zones of rapid
_________________________________.
12. Abyssal Plains and Hills
a. _______ of the Earth’s surface.
b. These are flat, _____________________ of sedimentcovered ocean floor, found on the ______________ of all
oceans; most commonly in the _________________.
c. Why are they so flat?
d. Hills are associated with _______________________.
13. Seamounts and Guyots
a. _____________________ projections that do not rise
above the ___________________.
b. Shape:
c. Height:
d. Steepness:
e. Guyots are ______________________ seamounts, caused
by
14. Trenches and Island Arcs
a. Trench:
b. These are the most __________________ features on
Earth.
c. ____________________________ often originate in
them.
d. ______________ are the deepest part of the ocean.
e. Island arcs are ___________________ to trenches, from
__________________________-.