ESS - Ocean Basins

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25 Terms

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Seamount

A large, underwater volcanic mountain rising at least 1,000 meters above the surrounding seafloor.

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Abyssal plain

Flat or gently sloping areas of the deep ocean floor, typically found at depths between 4,000 and 6,000 meters.

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Abyssal hill

Small, underwater hills on the ocean floor, usually less than 1,000 meters in height.

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Atoll

A ring-shaped coral reef, island, or series of islets surrounding a central lagoon, often found in warm, tropical waters.

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Oceanic ridge

A continuous underwater mountain range formed by plate tectonics where new oceanic crust is created.

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Trench

A deep, narrow depression in the ocean floor, typically found at convergent plate boundaries where one tectonic plate is forced beneath another.

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Island arc

A curved chain of volcanic islands formed at a convergent boundary where an oceanic plate is subducted beneath another plate.

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Island chain

A series of islands, often formed by volcanic activity or tectonic processes, arranged in a line or curve.

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Gas hydrate (clathrate) deposit

A crystalline solid consisting of gas molecules, typically methane, trapped within a lattice of water molecules, found in permafrost or beneath the seafloor.

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Guyot

A flat-topped, submerged volcanic mountain with a broad summit, typically formed by erosion and subsidence.

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Hydrothermal vent

Openings in the ocean floor from which geothermally heated water emerges, often rich in minerals and supporting unique ecosystems.

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Continental rise

A gently sloping accumulation of sediment at the base of the continental slope, marking the transition between continental and oceanic crust.

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Continental slope

The steeply inclined region of the continental margin between the continental shelf and the continental rise.

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Continental shelf

The shallow, submerged platform extending from the shoreline to the continental slope, characterized by relatively gentle slopes.

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Submarine canyon

Deep, steep-sided valleys cut into the continental slope and shelf by underwater currents or geological processes.

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Barrier reef

A coral reef separated from the mainland or island shore by a lagoon, often parallel to the coastline.

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Rift zone

A region of Earth's crust where tectonic plates are moving apart, typically marked by volcanic activity and the formation of new oceanic crust.

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Fracture zone

A linear zone of fractures in Earth's crust, often associated with tectonic plate boundaries or the movement of oceanic crust.

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List Convective Cells

Polar Cell, Ferrel Cell, Hadley Cell

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List Wind Belts

Polar Easterlies, Westerlies, East Trade Winds, Westerlies, Polar Easterlies

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Doldrums

the belt around the Earth near the equator where sailing ships sometimes get stuck on windless waters

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Normal Conditions

Australia: Low pressure (rain), hot water. SA: High pressure, cold upwelling)

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El Nino

Australia: High pressure (hot) cooler water SA: Low pressure (rain mudslides) hot water

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La nina

Aus: Low pressure (rain) hot, SA: more upwelling (hot surface)

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2 plates

Nazca Plate (both convergent and divergent) Juan de fuca plate(convergent)