Transcript Oceans and Ocean Floor Structures

Oceans and Ocean Floor
Structures
There are four oceans
1. Atlantic
a. Named after the continent that sank
b. Getting larger
There are four oceans
1. Atlantic
a. Named after the continent that sank
b. Getting larger
2. Pacific
a. Largest feature on Earth
b. Getting smaller
There are four oceans
1. Atlantic
a. Named after the continent that sank
b. Getting larger
2. Pacific
a. Largest feature on Earth
b. Getting smaller
3. Indian
a. By India
b. Very active geologically
There are four oceans
1. Atlantic
a. Named after the continent that sank
b. Getting larger
2. Pacific
a. Largest feature on Earth
b. Getting smaller
3. Indian
a. By India
b. Very active geologically
4. Arctic
a. Smallest, some say it is only a sea
Pacific is largest
Atlantic is next largest
Indian is pretty big
Arctic is smallest
Oceanography is the study of the ocean
The Challenger (British) kind of started the whole thing in
1872.
Underwater Research is usually done with SUBMERSIBLES
Bathysphere is one that is held by a cable, and just kind of
dangled from a ship
Underwater Research is usually done with SUBMERSIBLES
Bathysphere is one that is held by a cable, and just kind of
dangled from a ship
Bathyscaph is self-propelled
SONAR is ofted used to measure depth of ocean floor.
Sound Navigation And Ranging
Ocean floor has two parts
Continental Margin
1.
Shallow
2.
Made of continental crust (granite)
Deep Ocean Basin
1.
Deep
2.
Made of oceanic crust (basalt)
Continental Margin
1. Not the shoreline
2. Starts at the shoreline with the continental shelf
a. Slopes very gently
b. Very wide in some places (Florida)
c. Very narrow in others (Oregon)
d. Often exposed during ice ages
Continental Margin
1. Continental Shelf
2. Continental Slope
a. Much steeper than the continental shelf
b. Contains Submarine Canyons
c. Experiences Turbidity Currents
Continental Margins
1. Continental Shelf
2. Continental Slope
3. Continental Rise
a. Gentle slope to ocean floor
b. Made of sediment from the Continental Shelf and
Slope
Deep Ocean Basin
1. Trenches
a. Made from subducting oceanic crust
b. Deepest part of the Earth
c. Location of HUGE earthquakes
Deep Ocean Basin
1. Trenches
2. Abyssal Plains
a. Flattest parts of the Earth
b. Deep
c. Very fine “mud”
Deep Ocean Basin
1. Trenches
2. Abyssal Plains
3. Mid-Ocean Ridges
a. Longest mountain range on Earth
b. Result of splitting of the Earth’s crust
c. Comes up to land in Iceland
d. Topped by a rift.
Deep Ocean Basin
1. Trenches
2. Abyssal Plains
3. Mid-Ocean Ridges
4. Seamounts
a. Isolated Island (like Hawaii)
b. Can become flattened by waves
i.
Called a guyout if it is below water
ii.
Named after a friend of the guy who
discovered them.