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# Drawing Conclusions Practice Exercises (page 2)

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Updated on Sep 29, 2011

### Practice 2: Time After Time

 (1) How do we know what time it is? Earth is divided into 24 time zones, one for each hour in a day. All locations within one zone share the same time.

Marking Meridians

 (2) How do we know where one time zone starts and another ends? Picture the world as a large orange—not that color or fruitiness, just that shape. Well, time zones are divided by meridians—imaginary lines that run from the North Pole to the South Pole (the top of the orange to the bottom). The meridians split the world into sections, like equal slices of orange. The prime, or zero, meridian runs through Greenwich, England. By international agreement in 1884, that's been the starting point from which all time is calculated.

Time Marches On

 (3) Doesn't it appear that the sun moves from east to west? Well, it doesn't. Earth actually turns from west to east as it rotates on its axis. And like Earth, time moves from west to east. So from that prime meridian in Greenwich, you add one hour for each time zone as you move east. You subtract one hour for each zone as you move west. (4) Let's say you're in London, England, and it's 3 P.M. on Monday. You want to know what time it is in Paris, France, to the east. Just add one hour for each time zone between the two cities and you'll discover it's 4 P.M. on Monday in Paris. (5) If you want to know the time to the west, subtract an hour per zone. You discover that when it's 3 P.M. on Monday in London, it's 10 A.M. in New York, 9 A.M. in Chicago, 8 A.M. in Denver, and 7 A.M. in Los Angeles. Farther west, across the Pacific Ocean, time continues to change hour by hour. Finally, about halfway around the world from England, an imaginary zigzag line forms the International Dateline . . . and suddenly it's another day! If it weren't, you'd continue going west and get back to London before you left! But instead, if it's 3 P.M. on Monday in London, it's 7 P.M. on Tuesday in Hong Kong!
 5. If you lived in Chicago, what could you conclude about time in Denver? a. It would be one hour later than in Chicago. b. It would be the same time as in Chicago. c. It would be one hour earlier than in Chicago. d. It would be one day earlier than in Chicago. 6. If it were noon in Chicago, what could you conclude? a. It's one hour earlier in Denver. b. It's one hour later in New York. c. It's already the next day somewhere in the world. d. all of the above 7. You can conclude the time difference between Paris and Chicago is a. 6 hours. b. 7 hours. c. 8 hours. d. 9 hours. 8. What can you conclude from the words, By international agreement . . . in paragraph 2? a. Some countries don't have any time zones. b. Only the most important countries have time zones. c. All the countries of the world use these time zones. d. Some people in the world live in two time zones. 9. After reading the article, the best conclusion I can draw is that a. if you know the time in one place, you can figure out the time in other places. b. it's impossible to know what time it is halfway around the world. c. you should use only shadows from the sun to figure out the exact time. d. it should always be the same time everywhere!

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