Ocean Bottom Relief

Rationale: The continental slope connects the shelf to the deep ocean floor and has the steepest gradient, ranging from 2° to 5° or more, compared to the gentle 1° slope of the shelf.

Rationale: Guyots are flat-topped seamounts that were eroded flat by wave action when they were near sea level before subsiding into deeper water.

Rationale: Charles Darwin proposed the Subsidence Theory in 1842, suggesting that fringing reefs evolve into barrier reefs and atolls as volcanic islands gradually subside.

Rationale: Abyssal plains are vast, flat regions found at depths between 3,000 and 6,000 meters, covering a significant portion of the ocean floor.

Rationale: Turbidity currents—dense, sediment-laden underwater gravity flows—erode the continental slope, carving out deep V-shaped submarine canyons.

Rationale: Deep-sea trenches like the Mariana Trench are formed at convergent plate boundaries where an oceanic plate subducts beneath another plate.

Rationale: The continental slope marks the true boundary between the continental crust and the oceanic crust.

Rationale: R.A. Daly proposed the Glacial Control Theory in 1910, linking coral reef formation to sea-level changes during the Pleistocene Ice Ages.

Rationale: Mid-oceanic ridges are divergent plate boundaries where tectonic plates pull apart, allowing magma to rise and form new oceanic crust (seafloor spreading).

Rationale: Abyssal hills are small volcanic structures formed from basaltic magma on the oceanic crust.

Rationale: The continental shelf is shallow, allows sunlight penetration for photosynthesis, and receives nutrient runoff from land, making it the premier fishing zone.

Rationale: The continental rise is formed by sediments accumulating at the base of the continental slope, bridging the slope to the abyssal plain.

Rationale: The Pacific Ocean, surrounded by the 'Ring of Fire', contains the vast majority of deep-sea trenches due to extensive subduction zones.

Rationale: The Challenger Deep in the Mariana Trench is the deepest surveyed point in the world's oceans, reaching approx. 10,994 meters.

Rationale: Sir John Murray proposed the Standstill Theory, arguing that coral reefs grow on stationary submarine banks without requiring island subsidence.

Rationale: Echo-sounding and sonar techniques measure water depth to map underwater topography and ocean bottom relief (bathymetry).

Rationale: The continental shelf is part of the continental margin, not the deep ocean basin.

Rationale: The average width of the continental shelf is about 70 to 80 kilometers, though it varies widely from narrow shelves off mountainous coasts to hundreds of kilometers off broad plains.