Who Helps at the Shore?

Rockport is a town by the sea. Out in the water, near Rockport, there is a small island. It is called Thacher Island. On Thacher Island there are two tall lighthouses. They stand side by side. They look the same. People call them the Twin Lights. Twins are two that match. (Star) Can you hold up two fingers that match, like twins? The two towers are made of stone called granite. They were built a long, long time ago. They are so tall that you would climb more than 150 steps to get to the top. (Star) Let's pretend to climb the stairs. Step, step, step. Are you tired yet? Near the island, there are big rocks hiding under the water. Boats must stay away from them. The lighthouse light shines out over the water so boats can see where the rocks are and stay safe. (Star) Why do boats need a light at night? Long ago, people called lighthouse keepers lived on the island. They kept the lights shining every night. Today, the town of Rockport takes care of part of the island, and helpers called keepers still come to look after it and welcome visitors. When the weather is foggy, it is hard to see. When the weather is stormy, the waves are big. On those days, lights and loud horns help boats, and many boats stay safe in the harbor. (Star) What weather makes it hard to see?