What is Plate tectonics? In this presentation, you will be able to learn about Plate Tectonic Theory, the Plate Boundaries, as well as the Evidences of Plate Movement.

2. 1.1 The Plate Tectonic
Theory
1.2 Plate Boudaries
1.3 Evidences of Plate
Movement

4. A. CONTINENTAL PLATES – landmasses
B. OCEANIC PLATES – ocean bottom

5. Mon
. . .

6. 1.1 The Theory of Plate Tectonics
- American, Canadian, and British geophysicists
- Earth’s surface is divided into a number of shifting plates
about 50 miles in thickness

7. NO PLATE TECTONICS

8. NO PLATE TECTONICS
= less occurrence of earthquakes
= uniform weather condition
= landscapes would be older

9. . . .
Mechanism of Plate Tectonics:
1. Continental Drift Theory
- Proposed during early 1900s
- “ fit together ”
Alfred Wegener

10. - Pangaea (one giant landmass
- that split to form the continents)
- Paleomagnetism, convection
currents, and seafloor spreading
confirmed Wegener’s hypothesis
(1940s and 1950s)

11. . . .
Mechanism of Plate Tectonics:
2. Seafloor Spreading
- Better observations of the ocean
floor (1950s and 1960s)
- Mid-ocean ridge (large system of
underwater mountains)
- Rift valley (deep crack in the mid-
ocean ridge that runs through their
center)
- Subduction (one plate containing
oceanic lithosphere descends the
adjacent plate)
Harry Hess

13. Tue
. . .
>

14. 1.2 Plate Boundaries
- Asthenosphere (plate lie atop a large of partially molten
rock)
- Divergent, convergent, and transform boundaries

15. . . .
1. Divergent Boundary
-plates move apart
-Also called constructive boundaries because new material is
added to the plates

16. . . .
2. Convergent Boundary -one plate is being pushed under
another
-also called destructive boundaries because plate material is
being subducted
-oceanic plate with continental plate, oceanic plate with
oceanic plate, or continental plate with continental plate

17. . . .
3. Transform Boundary
-transform fault
-plates slide past each other
-creates a fault valley or under sea canyon

18. Mon
. . .

19. Fossils
Rocks
Glacial Deposits
Climate change
Paleomagnetism

20. . . .
1. Fossils
- remains or traces of plant and
animal life, usually preserved in
rocks or sediments
- earthworms fossil remains in
Africa and South America
Fossils

21.  Glossopteris (South Africa, Australia, and India)

22.  Mesosaurus (South America and Africa)

23. . . .
2. Rocks
-mountains made of folded rocks of the same age and
type have been found across different places

24. . . .
3. Glacial Deposits
-glacial till deposits in the southern hemisphere
-South America, Africa, India, Australia, Antarctica
(same ice sheet)

25. . . .
3. Climate Change
-coal forms in warm, swampy
climates yet, large coal
deposits have been found in
Antarctica
-limestone deposits from coral
reefs, which form in tropical
climates, have been discovered
in Northern Central United
States and other places far from
the equator

26. . . .
4. Paleomagnetism– Wegener
-hot magma rises to the surface, cools, and the
minerals become magnetized in accordance with
Earth’s magnetic field

27. . . .
Thank You!!!

28. BOOK:
Religioso, T., Darvin-Faraon, G., Cordero-Navaza, D., & Vengco, L. (2015). You and the
NATURAL WORLD SCIENCE (Grade 10). Phoenix Publishing House, Inc.:927 Quezon
Avenue, Quezon City
PICTURES:
https://www.eartheclipse.com/geology/theory-and-evidence-of-seafloor-spreading
https://www.britannica.com/biography/Alfred-Wegener
https://geologyhubblog.wordpress.com/2017/07/14/pangaea-proxima-the-
supercontinent-of-the-future/
https://www.khanacademy.org/humanities/big-history-project/solar-system-and-
earth/knowing-solar-system-earth/a/alfred-wegener-and-harry-hess
https://www.pinterest.ph/pin/716353884470400331/
https://www.britannica.com/animal/Mesosaurus
https://slideplayer.com/slide/13820628/
https://discoveringantarctica.org.uk/oceans-atmosphere-landscape/ice-land-and-
sea/antarcticas-geology/
https://www.tradeindia.com/fp5685640/Yellowish-And-Cream-Limestone
https://study.com/academy/lesson/seafloor-spreading-theory-definition-quiz.html