Earth!
Earthquakes/
volcanoes
Plate Tectonics
100
Earth's outer core is a
very dense liquid
100
Where are most volcanoes located?
on the ocean floor
100
What force moves Earth's tectonic plates?
Convection in the mantle
200
Earth's mass is in the
mantle
200
Why do most earthquakes occur in California and Alaska?
they are located on the plate boundary.
200
What is an area of raised, flat land?
a plateau
300
Where are Earth's tectonic plates located?
they float on top of the lower mantle
300
If two plates are moving at a plate boundary, what is most likely to happen at this boundary. (Two plates moving away from each other)
strong earthquakes.
300
A scientist found a strange fossil along the eastern coast of South America. How could the fossil be used to support Alfred Wegener's theory of continental drift?
The fossil would be found on the western coast of Africa.
400
What makes us the lithosphere?
Earth's crust and the liquid part of the mantle
400
What do seismographs detect?
ground movement as it occurs.
400
The North American Plate and the Eurasian Plate move away from each other about _____________ each year. a. 6 kilometers b. .2 millimeters c. 2 centimeters
c. 2 centimeters
500
What is the ocean floor spreading and how does it support the theory of continental drift?
seafloor spreading occurs at ocean ridges. Molten magma pushed through Earth's crust and cools, forming new crust. It supports the continental drift because scientists found alternating rows of north/south magnetism on the ocean floor near the mid-ocean ridge. This shows that rock has been slowly spreading out as new crust formed.
500
What is formed where two plates move together?
mountains
500
What is Pangaea and why was it part of Wegener's theory?
Wegener suggested that all the continents were once joined in a large continent called Pangaea. His theory says that Pangaea broke apart and created today's continents. His theory says that the continents drifted apart in the past and continue to do so today.
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