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EVERYTHING IN YELLOW
BUT PLEASE TAKE YOR
TIME REVIEWING THE
ENTIRE SLIDE
Resources from the Ocean
• Are divided into 2 categories
–Living
–Nonliving
• We can harvest minerals,
food, and energy from the
ocean
Living Resources
• Seaweed: species of
alga (kelp)
–Rich in protein
–Fast growing
–Used in jellies, ice
cream, sushi
Living Resources
Fishing: 75 million tons of fish
harvested
–Drift nets: catch large numbers of
fish but also catch other animals
(dolphins and turtles) (BYCATCH)
–Overfishing: taking more fish than
can be naturally replaced
Living Resources
• Farming: raising ocean food in
farms (AQUACULTURE)
–Nets protect fish from predators
–Help supplement our fish supply
–Others: shrimp, oysters, crabs,
mussels
Nonliving Resources
• Oil and natural gas
• Desalination
• Sea-floor minerals
• Tidal energy
• Wave energy
Oil and Natural Gas
• Are nonrenewable
•
•
resources (see
vocab) they are used
up faster than they
can be replenished
naturally
Locate using seismic
equipment
Drill through many
layers of rock to get
to oil
Desalination
• process of removing salt from sea
water
• Used in hot, dry climates where there
is little rainfall to make drinking
water
– Middle East, Saudi Arabia
• Not as simple as it sounds
• Very expensive
Sea-Floor Minerals
• Found in nodules on
ocean floor
– Nodules form when
dissolved substances
stick to pebbles
• Contain manganese,
•
iron, copper, nickel,
cobalt, phosphates
Located in deeper
parts of ocean
– Mining is difficult and
costly
Tidal Energy
• (See vocab) Energy generated by the
movement of tides
• Uses the natural movement of tides
• Is a renewable resource (see vocab)
resource that can be replaced in time after
being used
• Clean and inexpensive
• Is practical in only a few places
– Coastline with shallow, narrow channels
Tidal Energy
Figure pg. 102 in textbook
Wave Energy
• Clean, renewable resource
• Different from tidal energy
• Uses constant motion of
•
waves
Can only be used in areas
where waves are strong
– In North Sea, waves
strong enough to make
power for parts of
Scotland and England
Diagrams from:
http://ocsenergy.anl.gov/guide/wave/index.cfm
Production is greatest in the surface
layers because of photosynthesis.
Microscopic algae (plankton) serve as
the base of the ocean food web and
provides most of the world’s oxygen
Currents and recycling processes make
nutrients, minerals, and gases available
to marine life.
UPWELLING-A CURRENT IN WHICH
COLD NUTRIENT-RICH WATER RISES TO
THE SURFACE FROM THE OCEAN
DEPTHS