The Big Idea
Framework Concept: Change The effects of ocean tides on land are an excellent example of how places change over time.

• Begin by discussing any experiences students may have had with oceans and beaches. Encourage students to describe the movement of the waves, and what the undertow feels like. Help students understand that the waves pulling the sand from under their feet is an example of how the oceans change the land--taking land away and giving it back.
• Use a map of the world to show students the coastlines of the different continents. Cover the ocean labels with paper and have volunteers write the names of the oceans on the paper.

Lesson Outline
Use the Lesson Outline to preview the content of the lesson. You may wish to print it for your students as a guide during reading.

Check for Understanding

• Ask students to write a paragraph about how waves change the coast.
• Have students create clay models to show how waves take away land and give back land to the coast.