Name:
Tides Lab
High vs. Low Tides The ocean is constantly moving from high tide to low tide, and then back to high tide. A high tide is when the water level is at the highest point and a low tide is when the water level is at the lowest point. No matter where you are in the world, there are two high tides and two low tides at each spot every day. There are about 12 hours and 25 minutes between the two high tides.
The position of the moon determines when high and low tides occur. Since the moon moves around the Earth, it is not always in the same place at the same time each day. So, each day, the times for high and low tides change by 50 minutes. You'll have to learn how to read a tide table in order to predict when the high and low tides will happen each day.
Procedure:
o Go to
o For each day, use the slider tool to see the water level at different times of the day.
o Find and record the highest and lowest sea level heights and the time of day that each occurred.
o Use a calculator to estimate the difference. (Highest-lowest)
o Use the chart at the left to help determine the phase of the moon. Continue for each of the first 16 days.
Observations:
March
Date |Highest Tide (m) |Time |Lowest Tide (m) |Time |Difference (m) |Phase of Moon | |1 | | | | | | | |2 | | | | | | | |3 | | | | | | | |4 | | | | | | | |5 | | | | | | | |6 | | | | | | | |7 | | | | | | | |8 | | | | | | | |9 | | | | | | | |10 | | | | | | | |11 | | | | | | | |12 | | | | | | | |13 | | | | | | | |14 | | | | | | | |15 | | | | | | | |16 | | | | | | | |1. There are ______ high tides and ______ low tides each day.
2. It takes about ______ hours to go from a high tide to a low tide.
3. The timing of the highest (or lowest) tide shifts by about _____ hour from one day to the next.
4. Based upon your data, what can you conclude about the relationship between the phase of the moon and the difference between highest and lowest tides?
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