13 Name Date Unit 1 © by Vista Higher Learning, Inc. All rights reserved. UNIT 1 bridges to Science Earth’s Story A Listen. Choose the best answer. EXAMPLE: You hear: What do you call scientists who study rocks? You choose: a. fossils b. geologists c. layers 1. a. 46 billion years old b. 4.6 billion years old c. 4.6 million years old 2. a. eras b. rocks c. fossils 3. a. eons b. eras c. intervals 4. a. rock formations b. rock layers c. rock colors 5. a. by age b. by size c. by dinosaurs 6. a. the geologic time scale b. the Jurassic period c. the Mesozoic era B Look at the geologic time scale in your Student Book. Answer each question. Use a complete sentence. EXAMPLE: In what eon did Earth form? 1. In what period did mammals first live on Earth? 2. In what period did reptiles first live on Earth? 3. In what era did dinosaurs live on Earth? 4. In what period did seed-bearing plants begin to grow? 5. How long ago did the Triassic period begin? 6. How long ago did the continents begin to form on Earth? Earth formed in the Hadean eon. BLC23_PB_LB_U01_001-018_C.indd 13 30/08/2021 10:51
RkJQdWJsaXNoZXIy NzM2OTg2