Daily Warm-Up Exercises Day 35 Why are fossils useful to scientists? Fossils show how life on Earth has changed over time. Where would we go to look for fossils? Sedimentary rocks often contain fossils, so we'd try to find a place with a lot of sedimentary rocks, where it's legal to collect samples. How old is the Earth? about 4.5 billion years old How old is the human race? about 200,000 years old Daily Warm-Up Exercises Daily Warm-Up Exercises 1

Discuss Event Sequence (Part 2, steps 6-10) Investigation 7 Fossils and Time

Sequence Challenge Turn to pages 67 and 69 in your lab notebook. Your challenge is to arrange the cards in the order in which the events occurred or the organisms first appeared on Earth. Use the questions at the top of page 71 to help guide your choices. Once you agree on a sequence, record that order on page 71, the oldest event first. Go to Fossweb.com = Login: LyijynenFOSSPage & Password: science7, select Time Machine! Daily Warm-Up Exercises 3

Discuss Sequences What were some of the easiest cards to put in sequence? Which ones were the hardest to sequence? Which cards caused the most disagreement in your pair? What other information would be helpful to you in sequencing the cards? 4 Daily Warm-Up Exercises 4