What causes the tides

Grade 6 Science Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   Table (example data)

   Water level at a dock. 6 a.m.: 0.9 m. 9 a.m.: 1.6 m. 12 noon: 2.2 m. 3 p.m.: 1.4 m. 6 p.m.: 0.6 m.

2. 1.

   Esme reads a dock's water-level table. At which time was it high tide?

   • 6 a.m., when the water was at 0.9 m
   • 9 a.m., when the water was at 1.6 m
   • 6 p.m., when the water was at 0.6 m
   • 12 noon, when the water was at 2.2 m

3. Table (example data)

   Water level in a harbor. 7 a.m.: 1.4 m. 10 a.m.: 0.8 m. 1 p.m.: 0.3 m. 4 p.m.: 1.0 m. 7 p.m.: 1.9 m.

4. 2.

   Jun reads a harbor's water-level table. At which time was it low tide?

   • 7 p.m., when the water was at 1.9 m
   • 10 a.m., when the water was at 0.8 m
   • 7 a.m., when the water was at 1.4 m
   • 1 p.m., when the water was at 0.3 m

5. Table (example data)

   Water level at a pier. 4 a.m.: 0.7 m. 7 a.m.: 1.3 m. 10 a.m.: 1.9 m. 1 p.m.: 1.1 m. 4 p.m.: 0.5 m.

6. 3.

   Kira reads a pier's water-level table. How high was the water at high tide?

   • 1.9 m, the reading at 10 a.m.
   • 0.5 m, the reading at 4 p.m.
   • 0.7 m, the reading at 4 a.m.
   • 1.3 m, the reading at 7 a.m.

7. Table (example data)

   Water level at a boat ramp. 8 a.m.: 1.5 m. 11 a.m.: 0.9 m. 2 p.m.: 0.2 m. 5 p.m.: 1.0 m. 8 p.m.: 1.8 m.

8. 4.

   Luz reads a boat ramp's water-level table. How low was the water at low tide?

   • 0.9 m, the reading at 11 a.m.
   • 1.5 m, the reading at 8 a.m.
   • 0.2 m, the reading at 2 p.m.
   • 1.8 m, the reading at 8 p.m.
9. 5.

   Noah checks a harbor's tide table and finds the times are the same on calm days and stormy days. What does that suggest?

   • Tides come from something steady, like the Moon's gravity.
   • The Sun causes most tides, because the Sun is larger than the Moon.
   • Rivers cause the tides, since their flow follows the same schedule.
   • Storms still cause the tides, but their effect is too small to notice.
10. 6.

    Ren says the Sun, not the Moon, has the biggest effect on tides. What is the best correction?

    • The Moon's light, not the Sun's, is what lifts the water into tides.
    • The Moon has the bigger effect, and the Sun adds a smaller one.
    • That is right, because the Sun is much larger than the Moon is.
    • Neither one, because tides come from winds that blow over the whole ocean.
11. 7.

    High tide at Tala's dock is at 6:00 a.m. The next high tide comes about 12 hours 25 minutes later. When is it?

    • 5:35 p.m.
    • 6:00 p.m.
    • 6:50 p.m.
    • 6:25 p.m.
12. 8.

    High tide at Zee's pier is at 9:30 a.m. The next high tide comes about 12 hours 25 minutes later. When is it?

    • 9:55 p.m.
    • 9:30 p.m.
    • 9:05 p.m.
    • 10:20 p.m.
13. 9.

    High tide at Ari's beach is at 2:00 p.m. Low tide comes about 6 hours 12 minutes later. When is low tide?

    • 8:12 p.m.
    • 7:48 a.m.
    • 8:50 p.m.
    • 8:00 p.m.
14. 10.

    High tide at Bo's harbor is at 10:40 p.m. The next high tide comes about 12 hours 25 minutes later. When is it?

    • 11:05 a.m.
    • 10:15 a.m.
    • 10:40 a.m.
    • 11:30 a.m.