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🌊 Oceanography

Explore Earth's largest habitat: its zones, currents, and hidden deep sea.

lessons

~30 min

to learn

🔬 Science

subject

Teens

level

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What you’ll learn

Describe the ocean's size, salinity, vertical zones, and seafloor features.The ocean covers about 71 percent of Earth and is salty from dissolved minerals. Sunlight defines vertical zones from the sunlit surface to the midnight deep, and the seafloor has shelves, ridges, and trenches.
Explain the ocean's movements: currents, thermohaline circulation, tides, and waves.Wind drives surface currents in gyres, while density differences drive the deep thermohaline conveyor. Tides come from the Moon and Sun's gravity, and wind creates waves that carry energy, not water.
Explore the deep sea, extreme life, and threats to the ocean.The deep sea is dark, cold, and high-pressure, with the Challenger Deep the deepest point. Hydrothermal vents host life powered by chemosynthesis. Pollution, warming, and acidification threaten ocean health.

Questions this course answers

About what percentage of Earth's surface is covered by ocean?

The ocean covers roughly 71 percent of Earth's surface and holds most of the planet's water.

Why is seawater salty?

Over millions of years rivers carry dissolved minerals to the sea and underwater vents add more, averaging about 3.5 percent salt.

Which ocean zone receives enough sunlight for photosynthesis?

The sunlit epipelagic zone at the top of the ocean is where photosynthesis and most familiar sea life occur.

What mainly drives large surface ocean currents?

Surface currents are driven mainly by wind and steered by Earth's rotation, forming circular gyres.

What drives the deep thermohaline circulation?

Thermohaline circulation is driven by density differences: cold, salty water sinks and slowly circulates through the deep ocean.

What is the main cause of ocean tides?

Tides are caused mainly by the gravitational pull of the Moon, with a smaller contribution from the Sun.

Grounded in trusted sources

NOAA, 'Layers of the Ocean' (noaa.gov)
Smithsonian Ocean, 'The Deep Sea' (ocean.si.edu)
Wikipedia, 'Bathypelagic zone' (en.wikipedia.org)
University of Hawaii, 'Depth Zones', Exploring Our Fluid Earth (manoa.hawaii.edu)

Every Wunder lesson is built from real, reputable sources — never invented.

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