1. 9/30/11 B DayLEQ: How do rocks, fossils, and ice cores help us paint a picture of Earth’s history? 1. Give one example of absolute dating. 2. Give one example of relative dating. 3. What is the law of superposition? 4. What is the difference between the lithosphere and the asthenosphere? 5. What causes tectonic plates to move and shift?
2. Review and Quiz Convergent Divergent Transform Subduction Mid-Ocean Ridge Seafloor spreading Trench Rift Valley BRAIN POP: plate tectonics
3. Once you finish… Read the article provided 2. In your notebook, draw a picture or diagram to illustrate a part of the article you read 3. If you finish early, jot down what you know about global warming and make a list of things you wonder about or would like to learn
4. Today’s LEQ: How do rocks, fossils, and ice cores help us paint a picture of Earth’s history? By the end of today, you should be able to… Identify index fossils and intrusions Explain how tree rings and ice cores can tell us about the past
8. Hot Q! The law of superposition states that in horizontal layers of sedimentary rock, each rock layer is ___________. a. Younger than the layer above it and older than the layer below it b. Neither older nor younger than other layers c. Older than the layer above it and younger than the layer below it d. Always older than any vertical layers
11. INTRUSION: Magma that pushes through rock layers. Intrusions are younger than the layers they cut through (the layers had to be there before it could cut through them!)
28. Diagram 2 Is Fossil 5 older or younger than fossil 3? How do you know?
29. Diagram 2 List the fossils in order from youngest to oldest
30. Hot Question The law of superposition states that in horizontal layers of sedimentary rock, each rock layer is ___________. a. Younger than the layer above it and older than the layer below it b. Neither older nor younger than other layers c. Older than the layer above it and younger than the layer below it d. Always older than any vertical layers
31. Superposition Illustration Your illustration must include: At least 5 layers of rock (use different colors!) At least one intrusion The following labels: OLDEST ROCK YOUNGEST ROCK INDEX FOSSILS INTRUSION
33. EOG Question From Last Year’s Test: A scientist has a hypothesis that a large volcanic eruption caused a change in global temperature. Which information gained from ice cores is most useful in supporting the scientist’s hypothesis? A. levels of dissolved oxygen B. identities of trace metals C. estimates of natural radioactivity D. amounts of atmospheric dust
34. Draw this in your notes: Evidence for climate change: Ice Cores Tree Rings
35. Ice Cores: samples of ice that tell about the AIR in Earth’s atmosphere over time Example:
36.
37. Ice Cores: samples of ice that tell about the AIR in Earth’s atmosphere over time Example: Carbon Dioxide in atmosphere
38. The Greenhouse Effect How does it feel when you get into a car after it’s been sitting in the hot summer sun all day? Why do you think it feels that way? The Greenhouse Effect works the same way! Greenhouse Brainpop
40. High CO2 = Warmer Temps Greenhouse Effect: certain gases, such as CO2, in Earth’s atmosphere trap energy from the sun and warm up Earth
41. HOT Q: You take an ice core from Antarctica and you find significantly more carbon dioxide bubbles in the layers of ice that are closer to the top. What can you infer about the climate?
48. Why does the Earth get colder after big volcanic eruptions? 24 Dust, ash glass, and rock are released into the air during a volcanic eruption. http://www.youtube.com/watch?v=fmsxmbVYMHo&NR=1
50. EOG Question From Last Year’s Test: A scientist has a hypothesis that a large volcanic eruption caused a change in global temperature. Which information gained from ice cores is most useful in supporting the scientist’s hypothesis? A. levels of dissolved oxygen B. identities of trace metals C. estimates of natural radioactivity D. amounts of atmospheric dust
51. Ice Cores and Climate Change! Ice in Greenland and Antarctica can be deeper than the height of skyscrapers and up to 530,000 years old!
52. Tree Rings: tell the amount of rain and precipitation over time. Example: 1 Ring = 1 year THICK = MORE RAIN THIN = LESS RAIN
53. SUMMARIZER: How do rocks, fossils, and ice cores help us paint a picture of Earth’s history?(3-5 sentences please!) Your answer MUST INCLUDE the following vocabulary: TREE RINGS ICE CORES INDEX FOSSILS LAW OF SUPERPOSITION
Hinweis der Redaktion
Science says is a hand motion game. When science says intrusion, take your hand and push it up into the air like you were magma pushing through rock.
After introducing index fossils, ask students which fossils could be index fossils in this diagram (2, 5, 3). Say, well if we know that fossil 2 is 50 million years old, what do we know about the layer it is in? If we know that fossil 5 is 25 million years old, what do we know about the age of the layer it is in?
