What causes the tides
Grade 6 Science Worksheet
Circle the best answer.
High tide at Esme's dock is at 9:00 a.m. on Monday. Tide times come about 50 minutes later each day. About when is that high tide on Wednesday?
- 9:00 a.m.
- 10:40 a.m.
- 7:20 a.m.
- 9:50 a.m.
High tide at Kira's beach is at 7:30 a.m. on Saturday. Tide times come about 50 minutes later each day. About when is that high tide on Monday?
- 9:10 a.m.
- 5:50 a.m.
- 7:30 a.m.
- 8:20 a.m.
High tide at Luz's harbor is at 8:20 p.m. on Thursday. Tide times come about 50 minutes later each day. About when is that high tide on Sunday?
- 5:50 p.m.
- 10:50 p.m.
- 8:20 p.m.
- 9:10 p.m.
Read this first
Table (example data)
Day 1, high 2.4 m, low 1.2 m. Day 2, high 2.3 m, low 0.2 m. Day 3, high 2.0 m, low 0.1 m.
Milo compares three days of tides. Which day had the greatest tidal range (high tide minus low tide)?
- Day 2, with a range of 2.5 m, found by adding the high of 2.3 and the low of 0.2.
- Day 1, because its high tide was the highest of the three days.
- Day 3, because its low tide was the lowest number in the whole table.
- Day 2, with a range of 2.1 m, found by subtracting 0.2 from 2.3.
Table (example data)
Day 1, high 1.7 m, low 0.2 m. Day 2, high 2.6 m, low 1.5 m. Day 3, high 2.4 m, low 0.4 m.
Noah compares three days of tides at a bay. Which day had the greatest tidal range (high tide minus low tide)?
- Day 2, because its high tide was the highest reading on the chart.
- Day 3, with a range of 2.8 m, found by adding the high of 2.4 and the low of 0.4.
- Day 3, with a range of 2.0 m, found by subtracting 0.4 from 2.4.
- Day 1, because its low tide was the lowest reading that week.
Table (example data)
Day 1, high 2.4 m, low 0.6 m. Day 2, high 2.9 m, low 2.0 m. Day 3, high 1.9 m, low 0.4 m.
Pia compares three days of tides at a river mouth. Which day had the greatest tidal range (high tide minus low tide)?
- Day 2, because its high tide was the tallest one shown in the bay table.
- Day 1, with a range of 1.8 m, found by subtracting 0.6 from 2.4.
- Day 3, because its low tide was the smallest reading among the days listed.
- Day 1, with a range of 3.0 m, found by adding the high of 2.4 and the low of 0.6.
Table (example data)
Day 1, high 2.0 m, low 0.1 m. Day 2, high 2.6 m, low 0.4 m. Day 3, high 2.9 m, low 2.0 m.
Ren compares three days of tides at a harbor. Which day had the greatest tidal range (high tide minus low tide)?
- Day 2, with a range of 3.0 m, found by adding the high of 2.6 and the low of 0.4.
- Day 2, with a range of 2.2 m, found by subtracting 0.4 from 2.6.
- Day 1, because its low tide was the lowest of the group.
- Day 3, because its high tide was the highest one recorded at the harbor.
Table (example data)
Day 1, new moon, range 2.5 m. Day 8, first quarter, range 1.1 m. Day 15, full moon, range 2.4 m. Day 22, third quarter, range 1.2 m.
Tala reads a Moon calendar with tidal ranges. Day 30 is a new moon. What range should the club expect?
- No way to tell, because the ranges change at random.
- A middle range, about 1.8 m, halfway between the big and small values.
- A large range, about 2.4 to 2.5 m, like earlier new moons.
- A small range, about 1.1 to 1.2 m, like the earlier quarter moons.
Ari studies the Moon calendar of tidal ranges. Which statement does the table support?
- The ranges are larger near new and full moons than near the quarter moons.
- The ranges are larger near the quarter moons than near new and full moons.
- The ranges are largest halfway between the Moon's phases.
- The ranges show no pattern, because they go up and down.
Bo sees that day 44 is a full moon. Using the table, what range is the most reasonable prediction?
- About 1.2 m, because a full moon has a small range.
- About 2.4 m, because full moons had a large range.
- No prediction is possible, because the ranges are random.
- About 1.8 m, because the range is halfway between the values.