Daily Warm-Up Exercises Day 38 Why isn’t all limestone white? Because limestone that contains a lot of sand or mud particles will be tan. Why aren’t metamorphic rocks likely to contain fossils? Because the heat and/or pressure that forms metamorphic rocks will usually destroy any fossils in the original rocks. What causes most limestone to be white or mostly white? Limestone is made up mostly of calcite (calcium carbonate). Daily Warm-Up Exercises Daily Warm-Up Exercises 1

Cut-Away Convention Exercise 7.4 Exercise 7.4 Image comprehension focus: Cut-away convention Goal: To practice or maintain understanding of the Cut-away convention Module Images: Transparency 39 p. 325 Type of Activity: Student Activity Overview: This activity provides students an opportunity to articulate their understanding of the cut-away convention so as to reinforce the type of perspective involved in this convention. Procedure: Show next slide and tell the students that they are going to use what they know about cut-away conventions to describe the perspective contained in the image (or to indicate that they understand the viewpoint or perspective of the image). First, ask the students to indicate where the Earth’s surface is on this image. [The surface is where the volcano is located]. Next, ask them to describe the perspective involved in this image. [That this view is as if one could cut through the earth so they could see both above the surface and the various layers beneath the surface.] Remind students that this perspective is not a realistic one. The goal of using it is so the viewer can visualize aspects of the image that are normally hidden (in this case, the layers of rock under the ground). >>>next slide<<<

CaSE Book Student Resources Book, page 54 Procedure: Show this slide and tell the students that they are going to use what they know about cut-away conventions to describe the perspective contained in the image (or to indicate that they understand the viewpoint or perspective of the image). First, ask the students to indicate where the Earth’s surface is on this image. [The surface is where the volcano is located]. Next, ask them to describe the perspective involved in this image. [That this view is as if one could cut through the earth so they could see both above the surface and the various layers beneath the surface.] Remind students that this perspective is not a realistic one. The goal of using it is so the viewer can visualize aspects of the image that are normally hidden (in this case, the layers of rock under the ground). >>>end of exercise<<<

Sequence Event Cards (Part 2, steps 1-5) Investigation 7 Fossils and Time

Important Rock Discovery What important discovery allowed geologists to add numbers to the relative time scale? radiometric dating, based on natural radioactive decay of elements Daily Warm-Up Exercises 5

Discuss Fossil Evidence Discuss the following questions in your groups: Imagine an organism from the past that is now extinct. It did not leave any fossils. How would we know that it ever existed? How do we know what organisms and environments existed in the past? Daily Warm-Up Exercises 6

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. Use Fossweb.com/Earth History/Time Machine to assist in sequencing. Lyijynen, science7. Daily Warm-Up Exercises 7