Welcome to Mr Aslanov’s Lessons
QUESTION-TYPE BASED TESTS
Aslanovs_Lessons
F.
The circulatory system of the world’s oceans is like
a huge conveyor belt, moving water and dis-
solved minerals and nutrients from one hemisphere to the other, and from the ocean's abyssal
depths to the
surface. The ACC is the longest current in the world, and has the largest flow. Through it, the deep flows of
the
Atlantic, Indian and Pacific Oceans are joined to form part of a single global thermohaline circulation,
During winter, the howling katabatics sometimes scour the ice off patches of the sea's surface
leaving large
ice locked lagoons, or ’polynyas'. Recent research has shown that as fresh sea ice forms, it is continuously
stripped away by the wind and may be blown up to 90km in a single day. Since only fresh water freezes into
ice, the water that remains becomes increasingly salty and dense, sinking until it spills over the
continental
shelf. Cold water carries more oxygen than warm water, so when it rises, well into the
northern hemi-sphere,
it reoxygenates and revitalises the ocean. The state of the northern oceans, and their biological productivity,
owe much to what happens in the Antarctic.
Choose the correct letter A, B, C or D.
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