Visit a local beach along the Texas coast, such as Galveston or South Padre Island.

Use a stick, shell line, or other materials to mark the highest point the waves reach in the sand.

Come back a few hours later to see if the tide has risen or fallen. Compare the high tide mark to see how the water has moved.

If possible, visit the beach at different times of day to observe how tides change with the sun and moon.

Think about what might cause the water to rise and fall, such as the moon’s gravity or wind. Consider how this affects wildlife and the landscape.

Share your observations about the tides, what causes them, and how they impact coastal ecosystems.