Reading the Tide Table Before the Beach
Before a trip to the seashore, some families check a tide table. A tide table is a chart that lists the times when the ocean will be high and low, and it is a handy guide because the water does not stay in one place all day long.
On many coasts, the sea rises and falls two times each day, and high tide is when the water reaches farthest up the beach while low tide is when it pulls back the farthest. The moon's pull on the ocean is a main cause of these changes, and the trip from high tide to low tide takes a little more than six hours.
Here is a pretend tide table for one morning. High tide is at 6:00 a.m. Low tide is at 12:15 p.m. How long will the water go out? Count from 6:00 to 12:00, which is six hours. Then add the extra 15 minutes. The answer is six hours and fifteen minutes.
Why does it matter? At low tide, more sand and rock are uncovered. That is the best time to look for shells and to peek into tide pools. There is one more thing to know. Each day, the tides come a bit less than an hour later than the day before. So you cannot use yesterday's table. Always read today's, and stay close to a grown-up near the water.