PRESENTATION OUTLINE
1. What evidence did Alfred Wagner use to support his theory of continental drift?
He supported his theory with evidence such as matching fossils, rocks and geologic structure.
2. Why do you think people didn't believe continental drift theory when Wagner first explained it?
He couldnt explain how the continents drifted apart.
3. Who were the two scientist that brought forth supporting evidence to Wagner's theroy, and what was their evidence?
The two scientist who supported Wagners theories were Arthur Holmes and Harry Hess. Arthur Holmes said that the thermal convection in the earth's mantle could cause continents to move. Harry Hess and other discoveries led to the plate tectonics.
4. What are the three different types of plate boundaries, describe each type?
Divergent Boundaries: where plates are moving apart and new crust is created by magma pushing up from the mantle
Convergent Boundaries: crust being destroyed as one dives under
Transform boundaries: crust passing each other
5. Give an example of a location on Earth where each type of plate boundary is present.
Divergent boundaries: East Africa rift in Kenya and Ethiopia
Convergent boundaries: West coast of South America where the oceanic Nazca Plate is crashing into the continent of South America
Transform boundaries: San Andreas fault
6. What are the three different types of convergent plate boundaries?
Oceanic-Continental Convergence, Oceanic-Oceanic Convergence, Continental-Continental Convergence
7. Give an example of a location on Earth where each type of convergent plate boundaries occur.
Continental-Continental Convergence: Himalaya
Oceanic-Oceanic Convergence: The Marianas Trench
Oceanic-Continental Convergence: Coast of South America
8. Explain what plate tectonics and ocean trenches have in common?
One tectonic plate moves under another.
9. How old are the rocks off the east coast of North America relative to the rocks right along the mid atlantic ridge, why do you think this is the case?
Over 4.6 billion years and because the earths formation effects it.
10. What is a convection current or cell, describe how it works (use a picture if you want)?
A convection current is a movement of hot liquid going in a circle by heating and cooling throughout.
11. What are the two main scouces of heat inside the Earth?
The two main sources of heat is radioactive decay and residual.
12. What types of tectonic forces create mountains?
The tectonic force used is create mountain is convergent.
13. What are horsts and grabens, and where can they be found?
A horst is a raised elongated block of the earths crust lying between two faults and a graben is a displaced downward blocks on either side. They can be found on earths crusts.
14. Describe how the mountains across the Utah and Nevada were formed?
Mountains across Utah and Nevada were formed by the earths plates spreading.
15. What are two bad things that can happen as a result of plate tectonics, how did plate tectonics cause these events?
Two bad thing that can happen because of the plate tectonics are volcanoes and earthquakes.
16. What are three good things that plate tectonics provide for humans, how do plate tectonics provide these things?
Two good things that can happen because of plate tectonics are good soil and fossil fuels.
