1. Sedimentary Cores and ice cores tell us about earth's past.
Geologic time added
to the end
Rock and Ice Core Samples – PAGE 19
Sedimentary Cores and ice cores tell us about earth's past.
But what do they tell us about Earth’s past?

2. NEW WARM UP PAGE 18 Warm Up PG 18 October 4, 2018
Describe the Law of Superposition…
What is an unconformity?
How do scientists determine the absolute age of a rock or fossil?
NEW WARM UP PAGE 18
Objectives: 8.E.2
-TSW understand how sedimentary rock layers, index fossils, and core samples provide evidence for changes in Earth’s past.
Essential Question:
-How do core samples show change in Earth’s history?

3. ----------------------BONUS--------------------------- 1
BONUS Can you identify an igneous intrusion? 2. Can you spot the unconformity?

4. Warm Up October 5
What is the difference between rock core and ice core samples?
Why do scientists study ice core samples taken from ice in Antarctica?
What is the difference between Precambrian time and Cambrian time on the geologic time scale?
OBJ. 8.E.2.1 / 2.2
-TSWU how ice cores and sedimentary rock core samples show us changes in Earth’s history.
-TSWU how Earth's geologic time scale describes Earth's history.
Essential Question:
-How do ice cores and sedimentary rock core samples show us changes in Earth’s history?
-What are the four major divisions on the geologic time scale?

5. Most of our earth’s layers are invisible to us.
So, how do geologists know all about Earth’s layers when they are mostly hidden under our feet?

6. They drill ROCK CORE SAMPLES!

7. These are earth CORE SAMPLES.
Do you see the unconformity?
Do you see the igneous intrusion?

8. Geologists collect and analyze these rock core samples all over the planet!

9. Geologists can use sedimentary rock core samples for the following reasons:

10. Geologists can use sedimentary rock core samples:
To tell us how our plates were once connected;

11. Geologists can use sedimentary rock core samples:
To tell us how our plates were once connected;
Just look how many core samples this collection is!

12. Geologists can use sedimentary rock core samples:
To discover how our plates were once connected & how they’ve moved;

13. Geologists can use sedimentary rock core samples:
To discover how our plates were once connected & how they’ve moved;

14. Geologists can use sedimentary rock core samples:
To discover how our plates were once connected & how they’ve moved;

15. Geologists can use sedimentary rock core samples:
To expose/discover how our plates were once connected & how they’ve moved;
To tell us about some major geological events that affected life on ancient Earth;

16. Geologists can use sedimentary rock core samples:
To expose/discover how our plates were once connected & how they’ve moved;
To tell us about some major (big time) geological events that affected life on ancient Earth.
Such as…
Volcanic eruptions,
Mudslides, Earthquakes,
meteorites, asteroids,
And much, much more…

17. Geologists can use sedimentary rock core samples:
To expose/discover how our plates were once connected & how they’ve moved;
To tell us about some major geological events that affected life on ancient Earth;

18. Geologists can use sedimentary rock core samples:
To expose/discover how our plates were once connected & how they’ve moved;
To tell us about some CATACLYSMIC (big time) geological events that affected life on ancient Earth;

19. Geologists can use sedimentary rock core samples: otherwise known as earth rock/soil core samples
To expose/discover how our plates were once connected & how they’ve moved;
To tell us about some CATACLYSMIC events that affected life on ancient Earth;
To tell us where valuable stuff is!

20. Geologists can use sedimentary rock core samples: otherwise known as earth rock/soil core samples
To expose/discover how our plates were once connected & how they’ve moved;
To tell us about some CATACLYSMIC events that affected life on ancient Earth;
To tell us where valuable stuff is!
Such as:
Gold,
Diamonds,
Coal, Oil,
Natural gas

21. Core Sample Activity Materials 1 Dixie cup
Small amount of sculpting clay
Sand
Potting soil
NC top soil
½ straw
Watch: Discover Ed: “Studying
Sediment Cores” 8:06

22. But rock isn’t the only cores we can drill.

23. But rock isn’t the only cores we can drill.

24. But rock isn’t the only cores we can drill
But rock isn’t the only cores we can drill. We drill ICE CORE samples also!

25. Why DO WE DRILL CORE SAMPLES IN ICE?

26. Ice core samples can tell us about the Earth's climate past…

27. Ice core samples can tell us our geologic & meteorlogic (weather/climate) past…
Ice traps our atmospheric gases and dust; preserving it in time!

28. Ice core samples can tell us our geologic & meteorlogic (weather/climate) past…
Gases trapped inside ice core samples show us what our past climate was like on Earth.

29. Ice core samples can tell us our geologic & meteorlogic (weather/climate) past…
High levels of CO2 trapped inside a layer of ice shows us that our Earth experienced a period of global warming.

30. Let’s look at the evidence…
Review the amount of dust and carbon dioxide found deep under ice towards the poles, going back hundreds of thousands of years.
Watch this video
before you being
Watch the Video
CO2 in the Ice Core Record 3:01

31. Let’s look at the evidence…
Review the amount of dust and carbon dioxide found deep under ice towards the poles, going back hundreds of thousands of years.
Directions:
Color the dust particles
red
Color the CO2 particles
green
Color the temperature
particles blue.

32. About how often do we have ice ages?

33. Going back in time, (left to right), do high amounts of dust possibly cool the Earth?

34. Explain how this could happen?

35. CO2 levels (carbon dioxide) come from biological activity (like us breathing out).

36. Are rising CO2 levels (carbon dioxide) in our past connected to warmer or cooler temperatures?

37. Could our overpopulation be driving global warming today
Could our overpopulation be driving global warming today? (Use the evidence below.)

38. Ice Core Analysis Reflection
About how often do we have ice ages?
Going back in time, do high amount of dust possibly cool the earth?
What natural disaster could possibly cause the earth to cool?
CO2 levels (carbon dioxide) come from biological activities (like us breathing out). Are rising CO2 levels in our past connected to warmer or cooler temperatures on Earth?
In 4-6 sentences, argue for or against whether overpopulation and pollution could be causing global warming. Use the ice core evidence from your graphs as support for your argument.

39. Let’s look at the evidence…
Review the amount of dust and carbon dioxide found deep under ice towards the poles, going back hundreds of thousands of years.
Watch: Discover Ed:
“Answers in Ice Cores”
8:19

40. Ice core sampling is neat!

41. The Geologic Time Scale –Page 22
The Earth is 4.6 BILLION YEARS OLD
A timeline of Earth’s history divided up into intervals of time based on major geological events.
DQ: Can you think of any major geological events in Earth’s past that would divide the Earth’s history into sections?

42. Divisions of Geologic Time
The geologic time scale is divided into smaller segments including EONS, ERAS, PERIODS, and EPOCHS.
Each one is separated by changes or events based on rock and fossil records.
There are four major eons: Hadean, Archean, Proterozoic,
and Phanerozoic.
DQ: What is the difference
between Precambrian time
and Cambrian time?