10/4/11 and 10/5/11
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Transcript of 10/4/11 and 10/5/11
10/4/11 B DayLEQ: How do chemical and mechanical weathering create unconformities in the earth?
1. What is one thing we can learn from ice rings? 2. What are two things that we can learn from ice cores?3. Is our climate getting warmer or colder? What do greenhouse gases have to do with it?!4. Copy and complete the following sentence:
Increased levels of carbon dioxide cause the global temperature to (increase/decrease).
Today’s LEQ: How do chemical and mechanical weathering create unconformities in the earth?
By the end of today, you should be able to…1. Compare and contrast chemical and
mechanical weathering
2. Explain how chemical and mechanical weathering can create unconformities in the earth
Track your Progress: Unit 1 Quiz B-1 = 95 -9 = 55 -17 = 15-2 = 90 -10 = 50 -18 = 10-3 = 85 -11 = 45 -19 = 5-4 = 80 -12 = 40-5 = 75 -13 = 35-6 = 70 -14 = 30-7 = 65 -15 = 25-8 = 60 -16 = 20
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
Draw this in your notes:Evidence for climate change:
Ice Cores Tree Rings
Ice Cores: samples of ice that tell about the AIR in Earth’s atmosphere over time
Example:
Ice Cores: samples of ice that tell about the AIR in Earth’s atmosphere over time
Example:
Carbon Dioxide in atmosphere
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
Let’s take a closer look…
High CO2 = Warmer Temps
• Greenhouse Effect: certain gases, such as CO2, in Earth’s atmosphere trap energy from the sun and warm up Earth
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?
1000 years of CO2 and Global Warming
Ice Cores: samples of ice that tell about the AIR in Earth’s atmosphere over time
Example:
Carbon Dioxide in atmosphere
Pollution
THE YEAR THAT CONGRESS PASSED THE CLEAN AIR ACT
Ice Cores: samples of ice that tell about the AIR in Earth’s atmosphere over time
Example:
Carbon Dioxide in atmosphere
Pollution
Volcanic Ash
HOT Q: The Earth gets COLDER after big volcanic eruptions!
WHY?
These things block the sun from reaching earth!
Why does the Earth get colder after big volcanic
eruptions? Dust, ash glass, and rock are released into the air during a volcanic eruption.
http://www.youtube.com/watch?v=fmsxmbVYMHo&NR=1
24
Clouds of ash can cover
entire continents!
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
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!
Tree Rings: tell the amount of rain and precipitation over time.
Example:1 Ring = 1 year
THICK = MORE RAIN
THIN = LESS RAIN
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
FOCUS VOCABULARY
27. Chemical Weathering28. Mechanical Weathering29. Erosion30. Unconformity
SMARTIE SCIENCE
Chemical Weathering
Mechanical Weathering
MECHANICAL WEATHERING:
• Physical changes to rock (rocks break into smaller pieces)
• Example:
Mountains get worn down to become pebbles!
EXAMPLE:ICE breaks
rocks apart!!
MECHANICAL WEATHERING:
• Physical changes to rock (rocks break into smaller pieces)
• Example: ice, salt, wind, and water break down rocks
CHEMICAL WEATHERING:
• Chemicals break down rock by chemically changing the rock
• Usually indicated by color change!
• Example:
COLOR CHANGE CAUSED BY ACID RAIN
CHEMICAL WEATHERING:
• Chemicals break down rock by chemically changing the rock
• Usually indicated by color change!
• Example: Acid Rain, rust
HOT Q: WHAT DO THEY HAVE IN COMMON?!
• Break or wear down
rock
Chemical or Mechanical?
Chemical or Mechanical?
Chemical or Mechanical?
Discovery Streaming Clip
• http://www.youtube.com/watch?v=lvKkPFoRiaw (breaker and woosh)
GALLERY WALK
Write Time! (In your notebook, write at least 3 complete sentences)
How was the activating strategy similar to chemical and mechanical weathering?Which step was CHEMICAL?Which step was MECHANICAL?
FRAYER DIAGRAM: UNCONFORMITY
UNCONFORMITY
DEFINITION:
CAUSES: EFFECTS:
PICTURE:
A missing piece in the rock record
PICTURE: (draw in Frayer diagram)UNCONFORMITY
How Unconformities are formed…
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es2902/es2902page01.cfm?chapter_no=visualization
FRAYER DIAGRAM: UNCONFORMITY
UNCONFORMITY
DEFINITION:
CAUSES:
-WEATHERING (breaks rocks down)
-EROSION (carries rocks away!)
EFFECTS:
PICTURE:
A missing piece in the rock record
Incomplete information about the past!
HOT Q’s!
1. How does weathering contribute to unconformities?
2. How do unconformities change scientists’ understanding of Earth’s history?
SUMMARIZER
1. What is the difference between chemical and mechanical weathering?
2. How does weathering create gaps in our knowledge about earth’s history?
3. How is an unconformity created?