Download 1. What evidence did Alfred Wagner use to support his theory of

1. What evidence did Alfred Wagner use to support his theory of Continental drift?
He thought that continents were an only piece of land but then they were separated.
2. Why do you think people didn't believe continental drift theory when Wagner first
explained it?
Because he didn’t prove why continents were separated.
3. Who were the two scientists that brought forth supporting evidence to Wagner's
theory, and what was their evidence?
They were Arthur Holmes and Harry Hess. Their evidence was that thermal
convection in the earth’s mantle could cause continents to move, but they
suggested that the continents didn’t move but were “carried” by larger pieces of
the earth’s crust called tectonic plates. And it let to the development of plate
tectonics.
4. What are the three different types of plate boundaries, describe each type?
There are three different types of plate boundaries:
•
Divergent boundaries: where new crust is generated as the plates pull away from
each other.
•
Convergent boundaries: where crust is destroyed as one plate dives under
another.
•
Transform boundaries: where crust is neither produced nor destroyed as the
plates slide horizontally past each other.
5. Give an example of a location on Earth where each type of plate boundary is
present.
•
Divergent boundaries: the oceanic Nacka Plate and the South American Plate.
•
Convergent boundaries: the Indian and Eurasian plates.
•
Transform boundaries: the Pacific Plate and the North American Plate.
6. What are the three different types of convergent plate boundaries?
The three different types of convergent plate boundaries are: divergent
boundaries, convergent boundaries and transform boundaries.
7. Give an example of a location on Earth where each type of convergent plate
boundaries occurs.
•
Divergent boundaries: the Mid-Atlantic Ridge (from the Arctic Ocean to beyond
the southern tip of Africa).
•
Convergent boundaries:
- Oceanic-continental convergence: the coast of South America along the PeruChile trench.
- Oceanic-oceanic convergence: the Marianas Trench.
- Continental-continental convergence: in Asia (Himalaya).
8. Explain what plate tectonics and ocean trenches have in common?
Plate tectonic and ocean trenches have in common the process that takes place at
convergent boundaries by which one tectonic plate moves under another tectonic
plate called seduction.
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 it’s because the age of the formation of the Earth and
the age of the rocks are the same.
10. What is a convection current or cell, describe how it works (use a picture if you
want)?
A Convection current is the internal movement of the flow of hot fluid in a circular
motion caused by heating and cooling.
11. What are the two main sources of heat inside the Earth?
There are two main sources of heat inside the Earth: radioactive decay and
residual heat.
12. What are two bad things that can happen as a result of plate tectonics, how did
plate tectonics cause these events?
Two bad things that can happen as a result of plate tectonics
are: volcanoes and earthquakes.
13. What are three good things that plate tectonics provide for humans, how do plate
tectonics provide these things?
Three good things that plate tectonics provide for humans are: fertile soils, ore
deposits and fossil fuels. Making their plate tectonic processes.
14. What is the Ring of Fire?
It’s an area of large numbers of earthquakes and volcanic eruptions that encircles
the Pacific Ocean and it is formed where the Pacific Plate collides with other
tectonic plates.
15. How will knowing about plate tectonics help you to understand the world
around you?
The mountains were formed by the motion of the plates and they could
produce earthquakes, volcanoes, tsunamis.... The convection currents
cause that plate tectonics can separate because 200 million years ago
there was a large continent called “Pangaea” and an enormous ocean
Panthalassa.