Download Plate Tectonics 1. What evidence did Alfred Wagner use to support

Plate Tectonics
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 Nazca 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:- Oceaniccontinental convergence: the coast of South America along the Peru-Chile trench.Oceanic-oceanic convergence: the Marianas Trench.- Continental-continental
convergence: in Asia (Himalaya).• Transform boundaries: the San Andreas Fault
zone in California, that it connects the East Pacific Rise with the South Gord.
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
subduction.
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? ocean trenches
have in common? 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 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 types of tectonic forces create mountains? Two bad things that can
happen as a result of plate tectonics are: volcanoes and earthquakes.
13. What are horsts and grabens, and where can they be found? Three good things
that plate tectonics provide for humans are: fertile soils, ore deposits and fossil
fuels. Making their plate-tectonic processes.
14. Describe how the mountains across the Utah and Nevada were formed? 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. What are two bad things that can happen as a result of plate tectonics, how did
plate tectonics cause these events? 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.
16. What are three good things that plate tectonics provide for humans, how do
plate tectonics provide these things? They use them to walk on and live on.