UNIT X UNIT 2 | 71 B Use images to develop vocabulary Write the vocabulary words (weathering, erosion, erodes, cracks, freezes, expands) on the board. Review their meanings. Give students time to write their answers down. ANSWERS Sample answer: Weathering causes the hoodoos to erode. Erosion from the wind breaks down small pieces of the rock and carries them away. Acid rain breaks down the rocks, too. Snow that falls on the rocks eventually melts and runs down into the cracks, then freezes again and expands. This is called frost wedging and makes the cracks bigger. C Exchange ideas In pairs, have students read the question and discuss their opinions. Encourage them to support their answers with evidence from the text. Write students’ inferences on the board and note any similarities in the answers. ANSWERS Sample answer: The hoodoos will become so thin that they will break and fall down. D Apply new knowledge Have students think about rock formations that they have seen or are familiar with. Read the questions aloud and have students discuss them in pairs. Tell students to brainstorm their ideas and write them down. Then they write a short summary to share with the class. ANSWERS Sample answer: A hiking trail just outside of town has sandstone arches. They look like an upside-down letter U. They’re tall, and you can walk under them. Practice Book p. 38 Assessment Program p. 28 COMMUNICATE PRACTICE FORMATIVE ASSESSMENT DIFFERENTIATED INSTRUCTION Scaffold • Have students use their vocabulary cards from the previous lesson to help them with Activity B. • For Activity C, remind students that to infer means more than guessing; it is using prior knowledge and understanding to make a logical assumption. Amplify Have students write their descriptions about hoodoos from Activity B as compound and complex sentences. Tell students to write two examples of each type of sentence. Talk and write: A natural wonder Explain what a natural wonder is. Using a Venn diagram, compare and contrast the structure of a hoodoo with that of a pyramid. B Use the vocabulary Look at the pictures and describe how hoodoos form. C Discuss What can you infer will happen to the hoodoos after more time passes? D Making connections Are there any large rocks or rock formations in your area? Where? What do they look like? 71 UNIT 2 UNIT 2 / CONNECT TO SCIENCE
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