1. Ms. Yewande 8th Grade Science
Earth’s History
Ms. Yewande 8th Grade Science

2. Warm-up: Write questions and answers in notebook.
What is the first thing a student should do if an accident happens during a science experiment?
Report to the teacher
Clean the laboratory station
Locate the nearest exit
Put on safety goggles

3. Warm-up: Write questions and answers in notebook.
Which device is used to determine the volume of a liquid?
Anemometer
Graduated cylinder
Test tube
Thermometer

4. Lab Safety Safety Rules:
Always wear safety goggles whenever you are working with chemicals or other substances that might get into your eyes.
Never reach across a flame.
Immediately notify your teacher if any chemical gets on your skin or clothing to find out what to do to clean it off.
Never look directly into a test tube when mixing or heating chemicals.
Always point a test tube away from you and others when heating it over a flame or other heat source.

5. Lab Safety Safety Rules:
Never smell a chemical directly from the container. Wave your hand over the opening of the container and “waft” the fumes towards your nose.
Never taste a chemical unless you are instructed by your teacher to do so.
Always clean up your work area and equipment after an experiment is completed. Equipment must be returned to its proper place.
Read and follow all directions exactly as they are written. If in doubt, ask your teacher for help!
Never mix chemicals (or perform tests) without your teacher’s permission.

6. Lab Safety Safety Rules:
Never mix chemicals without your teacher’s permission.
Never run (or push someone else) in the lab. ( this rule applies at all times!)
Keep lids on bottles and containers when not in use.
Never use broken or chipped glassware.
Keep your work area clean and keep all materials (clothing, hair, papers, etc.) away from a flame or heat source.

7. Lab Safety Safety Rules:
Always clean up your work area and equipment after an experiment is completed Equipment must be returned to its proper place.
Immediately notify your teacher if you get cut or have another injury when performing an experiment.
Wash your hands before and after each experiment.

8. Classwork
Complete the classwork in notebooks

9. Lesson
November 4, 2013

10. Plate Tectonics

11. Earth’s Layers
The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed.
This crust is not a solid shell; it is broken up into huge, thick plates that drift atop the soft, underlying mantle.

12. The Crust Outermost layer 5 – 100 km thick
Made of Oxygen, Silicon, Aluminum

13. The Mantle Layer of Earth between the crust and the core
Contains most of the Earth’s mass
Has more magnesium and less aluminum and silicon than the crust
Is denser than the crust

14. The Core Below the mantle and to the center of the Earth
Believed to be mostly Iron, smaller amounts of Nickel, almost no Oxygen, Silicon, Aluminum, or Magnesium

15. Tectonic Plates

16. Plate Tectonics Greek – “tektonikos” of a builder
Pieces of the lithosphere that move around
Each plate has a name
Fit together like jigsaw puzzles
Float on top of mantle similar to ice cubes in a bowl of water

17. Continental Drift Alfred Wegener 1900’s
Continents were once a single land mass that drifted apart.
Fossils of the same plants and animals are found on different continents
Called this supercontinent Pangea, Greek for “all Earth”
245 Million years ago
Split again – Laurasia & Gondwana 180 million years ago

18. Evidence of Pangea

19. Sea Floor Spreading

20. Sea Floor Spreading
Mid Ocean Ridges – underwater mountain chains that run through the Earth’s Basins
Magma rises to the surface and solidifies and new crust forms
Older Crust is pushed
farther away from the ridge

21. How Plates Move

22. Different Types of Boundaries

23. Divergent Boundary – Arabian and African Plates
Arabian Plate
Red Sea
African Plate

24. Divergent Boundary – Iceland

25. Divergent Boundary - Oceanic

26. Divergent Boundary - Continental

27. Convergent Boundary – Indian and Eurasian Plates
Indian Plate

28. Convergent Boundary – Oceanic & Continental
&

29. Convergent Boundary – Oceanic & Oceanic
Note – plates are reversed
&

30. Convergent Boundaries - Continental
&

31. Transform Boundary – San Andreas Fault

32. Review Name the 3 main layers of the Earth What is a tectonic plate?
What was Pangea?
What is Sea-Floor spreading?
Name the three different types of plate boundaries and one location on Earth for each one