Grade 8 Science Water Systems on Earth The Ocean Addition!

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Presentation transcript:

Grade 8 Science Water Systems on Earth The Ocean Addition!

Oceans are important Primary water source for the water cycle 2. Control weather 3. Support diverse life 4. Provides humans with food, minerals, and resources

The Origin of the Oceans 1. Tectonic Plates 2. Volcanic action 3. Erosion 4. Glaciation

Tectonic Plates Has helped determine where ocean basins are located. Tectonic plates move changing the position of the continents.

Oceans then....

Oceans now

Volcanic Action Has built ocean floor along mid-ocean ridges in areas where plates separate. Has helped build continental divides in areas where plates have collided and mountain building occurs.

Water trapped in volcanic materials were released as vapour. It cooled, condensed and fell back to the earth. This water collected in the lowest parts of the Earth’s surface... The ocean basins.

Erosion Has aided the further development of continental drainage systems as material is removed and deposited into the ocean basins.

Glaciation A force of erosion in the development of continental drainage systems. Glaciers move materials towards the oceans.

Hudson Bay Lowlands, Ontario

Researching the Ocean Floor Technologies include Sonar 2. Satellites 3. Core sampling 4. Underwater photography/ videography

5. Deep sea submersibles 6. Diving

“UNDERSEA ADVENTURE”

Underwater explorations Shipwrecks Ex. The Titanic Discovered in 1985

Technologies: Past & Present DivingSubmersibles

Wire line depth probe Sonar

“GETTING TO KNOW THE OCEAN FLOOR”

Continental Margin

Continental shelf: the submerged part of the continent between the coast and the edge of the basin.

Continental slope: continental shelves slope gradually away from the land before dropping drastically.

Abyssal plain: Wide, open features of the sea. Formed of thick deposits of sediments. Where do these sediments come from?

Mid-Ocean ridge: Long, undersea mountain chains formed from volcanic eruptions. _vDhE ceans11/1PTOceans/OceanLayersxSectio n.jpg

Canadian Organizations involved in Ocean Research 1. Environment Canada 2. Federal Fisheries 3. Ocean Science Centre 4. Centre for Cold Ocean Research (C-CORE at MUN)

Ocean Currents... A large amount of ocean water that moves in a particular and unchanging direction.

2 Types of Ocean Currents Surface currents Flow in the top m 2. Deep currents Flow below 200 m

Surface Currents Factors that influence surface currents are: 1. Wind 2. Earth rotation 3. Shape of the Earth’s continents

Wind Air movement caused by uneven heating. The energy of the moving air is transferred by friction to the water molecules causing it to move.

Earth Rotation The Earth spins counter- clockwise. This spinning body deflects winds and currents depending on what side the equator they are on.

This alteration of direction is called the Coriolis effect. Clockwise in the Northern Hemisphere and Counter clockwise in the Southern Hemisphere

Shape of Continent Moving currents are forced to turn when they meet a solid surface.

Deep Water Currents The most important influences are: 1. Water temperature 2. Salinity 1udb0