Week 4/5: Limestone & Rock ages

Transcription

1 Week 4/5: Limestone & Rock ages

2 Monday Warm Up: Write two things you still need to finish in order to be prepared for your presentation tomorrow. LT: I can make a presentation about my solution to a science or engineering problem to the class with my group.

3 Glacier Project Pick a group of 3-4 people. Choose wisely!! Pick a scientific question or engineering problem about glaciers (look at our class list for ideas) that you want to investigate. Get your topic approved by Ms. P Use the engineering design process or scientific method to answer your question or solve your problem! Work as a group and fill in scientific/engineering report! Make poster explaining your project Present project to the class! (Tuesday)

4 Presentation Guidelines minutes long Presentation needs to include: - - Explanation of the problem/research question The steps you took to solve your problem/answer your question Your solution Limitations/challenges you might face when building your design or running your experiment Every group member must speak during presentation Must have a poster that explains the problem and your solution (with drawings!) You must ask one question about a different groups project after their presentation

5 Tuesday Warm Up: List at least three impacts melting glaciers could have on the environment or on society. LT: I make a presentation about my solution to a science or engineering problem to the class with my group.

6 Presentation Guidelines minutes long Presentation needs to include: - - Explanation of the problem/research question The steps you took to solve your problem/answer your question Your solution Limitations/challenges you might face when building your design or running your experiment Every group member must speak during presentation Must have a poster that explains the problem and your solution (with drawings!) You must ask one question about a different groups project after their presentation

7 Wednesday Warm Up: Write down two new things you learned during yesterday s presentations. LT: I can define Calcium Carbonate and identify at least 5 different forms of limestone.

8 Focus: Limestone - Review: Sedimentary rock, contains calcite, very hard - Formed in marine areas - Marine animals with shells and skeletons die and accumulate on the bottom of the ocean - Skeletons and shells are broken down into sediments which settle down in the bottom of the ocean and eventually turn into limestone Can learn a lot of important information from studying the layers of limestone worldwide and in the grand canyon.

9 Your Task: - Read p in book - Answer Think questions on p. 71 with a partner. Discuss first, then write down answers on blank piece of paper. Turn in ONE sheet for you and your partner

10 Calcium Carbonate - Major component of limestone - Calcium Carbonate = chemical name for CALCITE - Contains CARBONATE which breaks down in presence of acid (fizzes) - 15% of earth s sediments/sedimentary rock, 2% earth s crust - Also main ingredient in chalk, travertine, cave deposits, marble, and invertebrate shells - Seawater contains ingredients that react with each other to form calcium carbonate: calcium and bicarbonate

11 Forms of Limestone: Reef Limestone - Mainly composed of skeletons of marine animals, such as corals - Form in warm, tropical areas - Sections of Redwall Limestone in the GC include fossil corals...there must have been a warm, tropical sea present at one time

12 Forms of Limestone: Chalk - Composed of almost pure calcite - Powdery, fine-grained rock - Ex: White Cliffs in Dover, England

13 Forms of Limestone: Coquina - Made up of sorted and cemented fossil debris, mostly small shells and shell fragments - A soft limestone

14 Forms of Limestone: Freshwater Limestone - Can be identified by the types of fossils it contains - Less common than limestone from marine origin - Often contains snail shells

15 Forms of Limestone: Ooliths - Small grains of sand, silt, or shells around which layers of calcium carbonate have been deposited - Forms in warm, shallow conditions in mud - Particles move back and forth and calcite coats them, then they are cemented together - Forming on the Bahama bank off the coast of Florida

16 Forms of Limestone: Tufa - Forms in cool freshwater that is rich in calcium carbonate - Helps build stalactites and stalagmites in caves and can build precipitate towers - Ex: Mono Lake, CA

17 Forms of Limestone: Travertine - Calcium Carbonate rock that is harder and denser than tufa - Deposited around hot springs - Ex: Yellowstone National Park

18 Thursday Warm Up: What is Calcium Carbonate? List at least three different forms of limestone. LT: I can explain how sediment layers form and how sediment layers are studied.

19 Discussion Questions: - How does sedimentation occur? - Where do sediments go when they are added to water? - How do they form layers?

20 Basin Demo... - Creating a model of sedimentation Why is there water in the basin? Add sediment each class period Predict: what will the basin look like after several days? Predict: what would happen if we tilted the basin? Layers stay HORIZONTAL!

21 Key Term: Principle of Original Horizontality Sediment layers are generally deposited in a horizontal or nearly horizontal position

22 Key Term: Superposition Sediment layers are deposited in a time sequence, with the oldest on the bottom and the youngest on the top

23 Key Term: Uniformitarianism The theory that states that changes in the earth s crust during geological history have resulted from the action of continuous and uniform processes.

24 UNIFORMITARIANISM: - The idea that the way things happen today is the same way things have always happened - Scientists use observations about processes happening today to infer what happened in the past EXAMPLES: - Gravity Animals hunting Babies growing Erosion occurring

25 Discussion Question: How can we tell how old rock layers are? What are clues in the rocks? What tests should be run? - Brainstorm with your table group and make a list!

26 Stratigraphy Study of the distribution and sequence of sedimentary rock layers - William strata smith - Realized that if two rock layers or strata contain the same group of fossils they must be the same age

27 Discussion Question What are some clues we can look for in a rock layer that can give us insight into the environment in which it formed? Fossils, types of particles, crossbedding

28 Fossil Definition: Any evidence of past life preserved in the earth s crust The present is the key to the past

29 Video Fossilization:

30 Your Task: - Read p popcorn style as a class - Work with a partner to answer questions on p write in complete sentences!

31 Friday 11/18 - periods 1,3,5 Monday 11/21 - periods 2,4,6 Reading GC Rocks Warm Up: What is stratigraphy? LT: I can use rock and fossil evidence to make inferences about different grand canyon rock layers.

32 Recap - Law of Original Horizontality Superposition Uniformitarianism Stratigraphy Studying GC:

33 Fossil Definition: Any evidence of past life preserved in the earth s crust The present is the key to the past

34 Your Task: - Complete the column Environmental Interpretation WS in pairs - You may use: - Notes from journal - Science text books - p Part 1 together...

35 Kaibab Formation Appears that it is composed of limestone. How and where does limestone form? Forms when calcium carbonate precipitates from water and or shells. It is deposited under water, usually an ocean

36 What kinds of fossils are found in the Kiabab Formation? Sponges, corals, brachiopods, clams, snails Where do these types of animals live today? In the ocean, some in freshwater

37 What does the evidence tell you about the environment where Kaibab formed? Probably under water, maybe an ocean

38 Your Task: - Complete the column Environmental Interpretation WS in pairs - You may use: - Notes from journal - Science text books - p Part 1 together...