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7.2.6 e1 Rock Mystery

7.2.6 e1 Rock Mystery. Go through the stations slides in order, using your Rock Mystery worksheet. STATION 1: BUDDY’S LAUNDRY HAMPER. Look at the laundry basket to the right. Answer the questions on your paper in the correct space.

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7.2.6 e1 Rock Mystery

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  1. 7.2.6 e1 Rock Mystery Go through the stations slides in order,using your Rock Mystery worksheet.

  2. STATION 1: BUDDY’S LAUNDRY HAMPER Look at the laundry basket to the right. Answer the questions on your paper in the correct space. • What clothing was worn first, the brown and tan cheetah print or the black and white zebra print? How do you know? • If this laundry basket represents the clothing worn from Monday through Friday of one week, where would you find the clothing found on Friday? Why?

  3. STATION 2: CLIFF FACE View the image to the right. The letters label different layers of a cliff. Answer each question in the space provided on your worksheet. • Which layer is the oldest layer: A, B, C, or D? • Which layer is the youngest layer: A, B, C, or D? • How do you know which layer is the oldest and which is the youngest? Describe your reasoning. • Superposition: the Latin root super- means over or above. The word position means “a particular way in which something is placed or arranged.” What do you think superposition means when we’re talking about rock layers (in your own words)?

  4. STATION 3:LAUNDRY LAYERS Part 1: So what exactly is superposition? The idea that rock layers are formed in order of age, with the oldest on the bottom and the youngest on the top. • Looking at Buddy’s laundry hamper, the oldest clothes are at the (circle one on your paper). • The newest clothes are at the (circle one on your paper). Part 2: True or False: the process of dropping laundry in the hamper is the same now as it has always been, with the clothes most recently added ending up on top of the clothes that were added earlier.

  5. STATION 4: UNIFORMITARIANISM The idea that processes such as those of the rock cycle occur the same now as they did millions of years ago is called uniformitarianism. How does the idea of uniformitarianism help us understand rock layers and the age of the earth? • Name as many processes of the rock cycle you can remember. • How do these processes cause the layering you see in the picture to the right?

  6. STATION 5: TACO SOCKS Buddy only wears his taco socks on Taco Tuesdays. He NEVER wears these socks on any other day! • Describe a characteristic about the clothing Buddy could have worn the same day that he wore his taco socks. • How do you know Buddy could have worn that the same day? Read the previous slide if you need a hint.

  7. STATION 6: INDEX FOSSILS Index fossils are fossils that are found over a large geographic area, but the organisms only lived a short period of time (they went extinct). They are useful when trying to date and determine the relationship between rock layers. When an index fossil is found in a layer, the layer and the fossil are probably the same relative age. In your own words: What is an index fossil?

  8. STATION 7: ROCK LAYERS Part 3: Which fossils would be good index fossils in the rock strata (layers) below? Why? Fossil D Fossil S Fossil Q Fossil K Fossil N

  9. STATION 8: RELATIVE AGE Since Buddy only wears his socks on Tuesdays, any clothing found in the same ‘layer’ was also probably worn on Tuesday, so it has the same relative age as the socks. What does this have to do with rock layers? If we find a rock layer with an index fossil, or a fossil from an organism that was only around for a short span of time, we can come to the conclusion that the rock layer is the same relative age as the index fossil. Look at the hamper. • How does the ‘age’ of the blue and yellow shirt compare or relate to the ‘age’ of the taco socks? How do you know?

  10. STATION 9: FOSSILS Thinking about superposition, answer the questions. • Which fossil(s) are the oldest (less recent)? • Which fossil(s) are the youngest (more recent)? • How do you know which fossils are younger or older? Fossil D Fossil S Fossil Q Fossil K Fossil N

  11. STATION 10: BEST SHIRT Buddy wants to wear his favorite shirt to a family party on Sunday, but it’s dirty! He digs in the laundry hamper and gets it out so it can be washed • What does removing the shirt do to the ‘laundry strata’ or layers? Describe how it affects the week’s timeline.

  12. STATION 11: UNCONFORMITIES Just like removing the shirt changed the laundry layers, changes can occur to rock layers. These changes are called unconformities, and can occur in several different ways. Below are two examples of unconformities; for each, draw how you think it makes the rock layers look. • Law of Crosscutting: any feature that cuts across rock layers is younger than everything it ‘cuts’ (think magma intruding, or tunneling up through the layers). • Law of Inclusions: rock fragments included inside of other rocks are OLDER than the rocks they are inside of (chocolate chips are older than the cookies they are part of).

  13. STATION 12: 4 BILLION YEARS Read the questions on your worksheet first. Watch the video (also linked below) and then answer the questions. 4 Billion Years in Under 10 Minutes

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