PREDICT: What percent of the earth is covered in water? What percent is land? Explain your prediction.
PREDICT:What percent of the earth’s water is salt? What percent is fresh? Explain your prediction.
Area(1,000,000 km²) Volume(1,000,000 km³) Average Depth(m) Maximum Depth(m) Atlantic Ocean 82.4 323.6 3926 9200 Pacific Ocean 165.2 707.6 4282 11,022 Indian Ocean 73.4 291.0 3963 7460 Arctic Ocean 14.1 17.0 1205 4300 World Ocean Facts
Salinity • A measure of the amount of dissolved salts in a given amount of liquid
Estuary • A place where fresh & salt water meet.
shoreline • The point where land meets the water
Continental shelf • Sloping shelf of land that is made of the edges of the continent • The continental shelf regions also contain the highest amount of benthic life (plants and animals that live on the ocean floor).
Continental Edge • The part of the continental shelf that begins to angle sharply down
Continental Slope • The steep cliff like drop from the continental edge to the ocean floor that connects the continental shelf and the oceanic crust • It usually begins at 430 feet (130 meters) depth and can be up to 20 km wide.
Continental rise • Lower part of the continental slope which extends to the ocean floor
Abyssal Plain • The broad flat ocean bottom
Trenches • Deepest parts of the ocean created by the undersea rivers and currents • The deepest one, the Marianas Trench in the South Pacific Ocean, is more than 35,000 feet (10,668 meters), or almost 6.6 miles (10.6 kilometers) deep.
Mid-Ocean Ridge • A chain of mountains under the sea • The world’s longest mountain range. It runs almost unbroken for 40,000 miles.
Rift Valley • Large crack that runs down the middle of the Mid-Ocean Ridge
Seamounts • An underwater mountain formed by a volcano • Most seamounts began life as volcanoes formed over hot spots in the ocean floor. After the crust moves off the hot spot, the volcanic activity stops.
Guyots • Seamounts whose peaks have eroded and become a flat surface are called guyots • Inactive volcanoes on the ocean floor
Atoll • As the seamount sinks or its peak erodes, the seamount will disappear beneath the water leaving the coral ring. This is called an atoll.