"Worksheet: Tides, Tides and Tides - Mrs. Holland, Pleasant Valley High School"

ADVERTISEMENT
ADVERTISEMENT

Download "Worksheet: Tides, Tides and Tides - Mrs. Holland, Pleasant Valley High School"

150 times
Rate (4.6 / 5) 8 votes
Name:___________________________________________________ Period:_______ Date:________
Worksheet: Tides, Tides and Tides !
Tides are caused by the pull of gravity by both the moon and the sun. The moon is more important because
it closer to the earth. The moon causes the water on the side of the Earth nearest to the moon rises up in a
high tide. The water on the opposite side of the Earth also rises up in an high tide as the solid Earth under it
is pulled toward the moon. Low tides occur in between these places as water flows toward the high tides.
The Earth rotates on its axis once every 24 hours, so the moon causes high tides at any one location twice
every day. High tides would occur every 12 hours, except for one thing. The moon revolves around the
Earth at the same time as the Earth is rotating. When Earth completes one revolution, the moon has moved
13 degrees in the same direction. Therefore, the Earth has to rotate a little more before the moon is over
the same place that it was 24 hours earlier.
Part A: What tide is it ?
For this reason, high tides are slightly more than 12 hours apart. The afternoon high tide on one day is
about 12hours and 50 minutes later than the afternoon high tide on the previous day, and the same holds
true for low tides.
Tides for Cape May, New Jersey
Low tides
High Tides
Day of Week
A.M.
P.M.
A. M.
P.M.
Tuesday
9:16
9:28
2:43
3:30
Wednesday
10:09
10:25
3:52
4:33
Thursday
11:00
11:20
4:54
5:28
Friday
11:50
12:07
5:48
6:17
Saturday
12:14
12:39
6:37
7:04
Sunday
1:06
1:28
7:25
7:51
Monday
1:57
2:15
8:12
8:38
• Use the information in the table above to determine the time between the low tides and high tides for the
day. The first set is done for you.
Day of the Week
Time between low tides
Time between high tides
Tuesday
12 hours 12 minutes
12 hours 47 minutes
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Name:___________________________________________________ Period:_______ Date:________
Worksheet: Tides, Tides and Tides !
Tides are caused by the pull of gravity by both the moon and the sun. The moon is more important because
it closer to the earth. The moon causes the water on the side of the Earth nearest to the moon rises up in a
high tide. The water on the opposite side of the Earth also rises up in an high tide as the solid Earth under it
is pulled toward the moon. Low tides occur in between these places as water flows toward the high tides.
The Earth rotates on its axis once every 24 hours, so the moon causes high tides at any one location twice
every day. High tides would occur every 12 hours, except for one thing. The moon revolves around the
Earth at the same time as the Earth is rotating. When Earth completes one revolution, the moon has moved
13 degrees in the same direction. Therefore, the Earth has to rotate a little more before the moon is over
the same place that it was 24 hours earlier.
Part A: What tide is it ?
For this reason, high tides are slightly more than 12 hours apart. The afternoon high tide on one day is
about 12hours and 50 minutes later than the afternoon high tide on the previous day, and the same holds
true for low tides.
Tides for Cape May, New Jersey
Low tides
High Tides
Day of Week
A.M.
P.M.
A. M.
P.M.
Tuesday
9:16
9:28
2:43
3:30
Wednesday
10:09
10:25
3:52
4:33
Thursday
11:00
11:20
4:54
5:28
Friday
11:50
12:07
5:48
6:17
Saturday
12:14
12:39
6:37
7:04
Sunday
1:06
1:28
7:25
7:51
Monday
1:57
2:15
8:12
8:38
• Use the information in the table above to determine the time between the low tides and high tides for the
day. The first set is done for you.
Day of the Week
Time between low tides
Time between high tides
Tuesday
12 hours 12 minutes
12 hours 47 minutes
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Average Tidal Ranges in meters for
Part B: Average Tidal Range:
Cities in the United States
Cities
Average Tidal Range
The difference between the average high
Portland, Maine
2.7
tide and the average low tide is called the
Boston, Massachusetts
2.9
average tidal range. Because of the
New York, New York
1.4
varying shapes of the coastlines, different
Savannah, Georgia
2.2
places have different average tidal ranges.
Key West, Florida
.4
1. Create an appropriate graph in the
Galveston, Texas
.4
space provided to compare the average
San Diego, California
1.2
tidal ranges for various cities in the U.S.
San Francisco, California
1.2
Seattle, Washington
2.3
Cordova, Alaska
3.0
Honolulu, Hawaii
.4
Conclusions:
answer in the space provided.
1.
How many tides occur each day ?
2.
About how much time elapses between high tides on the same day ?
3.
Which city above had the highest average tidal range ?
4.
Which city had the higher average tidal range - Portland, Maine or Seattle, Washington ?
5.
Explain why it might be important to know the average tidal range for an area ?
6.
What causes tides on the Earth ?
7.
How is the moon positioned when there is a high tide ?
8.
What causes the water on the opposite of the Earth to rise up during a high tide ?
9.
Where do low tides occur ?
10.
Why do low tides occur ?
Page of 3