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- page 7 Access for more practices
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. Questions 14-18 Reading Passage 2 has six paragraphs, A-F. Which paragraph contains the following information? Write the correct letter, A-F, inboxes 14-18 on your answer sheet: 14 The example of a research on building weather prediction for agriculture 15 An explanation of how Antarctic sea ice brings back oceans’ vitality 16 The description of a food chain that influences animals’ living pattern 17 The reference of an extreme temperature and a cold wind in Antarctica 18 The reference of how Antarctica was once thought to be a forgotten and insig-nificant continent Questions 19-21 Match the natural phenomenon with the correct determined factor. Write the correct letter, A-F , in boxes 19-21 on your answer sheet. Globally, Antarctica’s massive size and 19 would influence page 8 Access for more practices
our climate. 20 circulated under contributory force from wind blowing from the west. The ocean temperature and index based on air pressure can help predict 21 in Australia. A Antarctic Circumpolar Current (ACC) B katabatic winds C rainfall D temperature E glaciers F pressure Questions 22-26 Choose the correct letter, A, B, C or D. Write the correct letter in boxes 22-26 on your answer sheet. 22 In paragraph B, the author intends to A B C D show Antarctica has been a central topic of global warming discussion in Mass media. illustrate how its huge sea ice brings food to millions of lives in the world. emphasise the significance of Antarctica to the global climate and ocean currents. illustrate the geographical location of Antarctica as the central spot on Earth. page 9 Access for more practices
23 Why should Australian farmers keep an eye on the Antarctic ocean temperature? A B C D 24 The decrease in the number of whales and seabirds is due to A B C D 25 What is the final effect of the katabatic winds?
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