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Circles and Solids Unit Review
Quiz by Kristy Woody
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Into the Sea What Is Erosion? Have you ever made a sand castle at the beach? You must pick a good spot for it. If it is too close to the water, waves will quickly wash it away. Ocean waves and wind can also wash away land. They can change the shape of an island, which is land circled by water. When wind and water change the shape of Earth, it is called erosion. Waves are the biggest cause of erosion at the beach. Ocean waves are always active and moving onto the shore. They carry the sand away bit by bit. Strong waves are one of the properties of big storms. These waves explode as they crash onto the beach. Storm waves can move a lot of sand quickly. Erosion of Beaches. Some people build houses near the ocean. Waves take away the sand between the houses and the sea. As the beach disappears, the water gets closer to houses and other solid buildings on the beach. Some buildings can even be washed away. Erosion of Rocks. Erosion also happens on steep, rocky cliffs or sharp slopes. First, waves smash into the bottom of the cliffs. Then they carry away tiny pieces of rock. Over time, many small pieces of rock wash away from the bottom of the cliff. This makes the top of the cliff weak.The cliff can crumble and fall into the sea. Stopping Erosion. Some local communities work to stop erosion to nearby beaches. These towns have built sea walls of large boulders or rocks. The rocks are placed in a row in the sea. When waves hit the sea wall, they slow down. Then the waves can't pull sand away.Some towns make rules about buildings on the beach. New buildings must be far from the water. Then they won't wash away like a sand castle.How Glooskap Found Summer Long ago, it grew very cold. Ice and snow covered the land. Fires could not keep people warm, and corn could not grow. Glooskap, the leader of the people, had to do something. Glooskap traveled far to the north. Everywhere he looked was cold and white with snow. He came to a house made of solid ice where a giant named Winter lived. Winter greeted Glooskap and invited him inside his house. Winter began to tell stories of the time when he ruled the Earth. Soon Glooskap fell asleep under Winter's spell. But Glooskap's messenger, Tatler, woke him. "Wake up, Glooskap!" said the bird. "In the south, you will find a woman who can defeat Winter," said Tatler. Glooskap traveled far to the south. He came to a land where it was warm and sunny. Grass grew and flowers bloomed in the beautiful land. Glooskap saw spirits dancing in a circle. At the center of the circle was Summer. She wore a crown of flowers in her long brown hair. Glooskap asked Summer to come north with him. She followed him to Winter's house of ice. Winter invited them in and asked them to sit down. He began to tell stories again. But Winter's spells could not capture Summer. She began to chant her own spell, and sweat ran down Winter's face. "I am stronger than you," said Summer. "You must leave this land and thaw your icy breath," she said. 10 Winter wept, and his tears became rivers of melted snow and ice. The corn grew, and flowers bloomed again. Summer told Winter, "You will have your own land in the north. It will always be winter there. You may come and visit other lands for part of the year. But in the spring, I will drive you out." Since that day, Winter has ruled for part of the year. But every spring, Summer drives him away. Sometimes it seems as if winter will never end. But Summer is stronger than Winter. Spring will always come.Circles and ProbabilityCIRCLES and TANGENTS INTERSECTING CHORDSCircles and ParabolaCIRCLES AND TRIANGLESCircles and Sectors (Post-Quiz)Partition circles and rectangles in halves, thirds and quarters