1) Sudden disasters filled the atmosphere with smoke and dust, ________ blocked out the Sun, causing the climate to become cold and dark. a) who b) which c) when d) whose 2) Several ice ages, _________ glaciers covered much Earth's surface, have taken place. a) whose b) where c) which d) when 3) Geologists, __________ study Earth's formation and its rocks , find out what happened in the past by looking at layers of rock. a) who b) when c) whose d) which 4) In the Antarctic, ________ plants and animals face a harsh cold environment, archaeologists have found evidence that this area was once much warmer. a) where b) who c) when d) which 5) Humans, ________ activities cause global warming, need to take action. a) which b) where c) whose d) who

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