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Question 1
Reread the third paragraph on page 1 below:
Spend a month on your beach, and you'll start to get a good sense of its tidal cycles. Each day, there are two high tides, and each day they arrive about an hour later than the day before. As the moon waxes from first quarter to full, the high tides get higher. They fall back as the moon wanes toward third quarter then rise again as the moon approaches new.
The author wants readers to know why people study tides and the effects that tides have on waves. How does this paragraph add to readers’ understanding of tides?
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Question 2
Reread the third paragraph on page 1 below:
Spend a month on your beach, and you'll start to get a good sense of its tidal cycles. Each day, there are two high tides, and each day they arrive about an hour later than the day before. As the moon waxes from first quarter to full, the high tides get higher. They fall back as the moon wanes toward third quarter then rise again as the moon approaches new.
How does the author use cause and effect in this paragraph to explain the idea of changing tides?
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Question 3
The first paragraph on page 2 reads:
To understand the basic reason for the tides, stop the moon in its orbit and let it begin to fall to earth. While we’re stopping things, stop the earth from spinning, too. The earth’s gravitational pull accelerates the moon toward the earth. At the same time, the gravitational pull of the moon accelerates the earth toward the moon. Take a snapshot of these falling bodies and examine what’s happening on the earth.
Which sentence explains how this paragraph is important to the development of ideas about what causes tides?
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Question 4
The second paragraph on page 2 reads:
It’s about 13,000 kilometers from one side of the earth to the other—a considerable distance. Because the gravitational pull of the moon decreases with distance, a chunk of earth closest to the moon feels a stronger gravitational attraction by the moon than a chunk at the center of the earth, and both feel a larger force than a chunk on the far side of the earth. If it were free of the earth, the chunk nearest the moon would accelerate faster and be pulled away from the center of the earth by the greater attractive force, while the chunk on the far side of the earth would be left behind by the rest of the earth.
How does this paragraph help the reader to better understand the cause-and-effect relationship between tides and the moon?