Oceanography: Ocean Relief, Currents & Tides Quiz — 7 Free Questions

Question 1

What is the term for the much deeper region of the ocean lying below the euphotic zone, receiving no meaningful sunlight at all, and therefore unable to support photosynthesis, though it still supports a range of specially adapted marine life?

Question 2

Which cold ocean current, flowing generally northward along the eastern coast of South America and named after a nearby island group, forms part of the broader anticlockwise circulation pattern, or gyre, of the South Atlantic Ocean?

Question 3

Drawing together the earlier discussion of both coral reef biology and rising global ocean temperatures, why are coral reefs worldwide, including India's own reef systems in Lakshadweep and the Gulf of Mannar, generally considered especially vulnerable to the effects of global warming and associated marine heatwaves?

Question 4

What is the general term for the very deep, narrow depressions found in the ocean floor, generally formed at convergent plate boundaries where one tectonic plate is subducted, or forced downward, beneath another, and including the deepest points found anywhere in the world's oceans?

Question 5

What is the name given to the comparatively steep incline that connects the outer edge of the continental shelf down to the much deeper ocean floor, marking the true geological boundary between a continent and the ocean basin proper?

Question 6

Which is the largest of the world's oceans by surface area, so vast that it is larger than the combined total area of all the Earth's continental landmasses put together?

Question 7

Which is the smallest and, on average, the shallowest of the world's major oceans, located around the North Pole and largely covered by floating sea ice for much of the year?

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About Oceanography: Ocean Relief, Currents & Tides

This quiz is meant for students preparing for the IAS examination and other competitive tests, and for anyone who wants a wide-ranging survey of oceanography -- the relief of the ocean floor, ocean currents and the tides. It begins with the main relief features of the ocean floor -- the continental shelf, slope and rise, the abyssal plain, oceanic trenches, mid-oceanic ridges, seamounts, guyots, atolls and submarine canyons, along with the world's major ocean basins. It then covers ocean temperature and salinity -- the thermocline, halocline and pycnocline, the factors that make seas such as the Red Sea or the Dead Sea unusually salty and the Baltic unusually fresh, and the different depth-based zones of the ocean. A third section covers ocean currents -- warm and cold currents such as the Gulf Stream, Kuroshio, Peru and Benguela Currents, ocean gyres, upwelling and downwelling, and the deep global thermohaline circulation. A fourth section covers tides -- their cause, spring and neap tides, the different tidal patterns, tidal range, tidal bores, and tidal energy, including in India. It closes with coral reefs, India's own reef systems, ocean acidification, and the Law of the Sea concepts of territorial waters and the Exclusive Economic Zone. When complete it will have one hundred and fifteen carefully checked questions, arranged in five packs of twenty-three.

Every question has four options, and the correct option can be in any position. After each question there is a detailed explanation of more than five lines, in simple Indian English that a school student can follow, giving the important terms, mechanisms and the points that examiners like to test.

Every fact has been checked against standard reference material on physical geography and oceanography.