Colliding Continents. No School AA 1
Earth Science: National Geographic – Colliding Continents Video Worksheet
1. List the 7 continents. Africa, Antarctica, Australia, Asia, North America, South America,
Europe
2. 4.6 billion years ago, the Earth is created from what? debris left over from the sun's creation
3. The heaviest elements, including lead and nickel, sink in the early molten E
...[Show More]
Colliding Continents. No School AA 1
Earth Science: National Geographic – Colliding Continents Video Worksheet
1. List the 7 continents. Africa, Antarctica, Australia, Asia, North America, South America,
Europe
2. 4.6 billion years ago, the Earth is created from what? debris left over from the sun's creation
3. The heaviest elements, including lead and nickel, sink in the early molten Earth to form the
inner core.
4. The lighter elements, including oxygen and silicon towards the surface and erupt in volcanoes
as molten rock.
5. Most scientists believe that the water that formed our oceans came from many,
many asteroids/meteors, which contained water.
6. How old was Earth believed to be when the first early, relatively stable land masses
formed? _______________ years old
7. What continent is believed to be the site of the earliest giant continental land mass
on Earth? Africa
8. What type of rock formed the first continents? Granite
9. As radioactive uranium decays it turns into what stable element? lead
10. Why is granite less dense than other rock in Earth’s mantle? it is made of lighter
elements/materials
11. The ‘giant jigsaw puzzle’ of interlocking pieces that make up Earth’s crust are called
what? Tectonic plates
12. The tectonic plates “float” on what layer of Earth? Mantle
13. Evidence for the theory of continental drift was first proposed in 1912 by what
German Scientist? Alfred wegner
14. When Wegener first proposed his theory of continental drift, why did the scientific
community reject his ideas? Considered insane
Nat Geo Colliding Continents Worksheet Name ________________________ Hour ____
Video Worksheet http://www.youtube.com/watch?v=KCSJNBMOjJs&list=HL1359292422
15. Heat escaping from the core creates convection currents in the next
layer of the Earth, the mantle.
16. How many tectonic plates can be identified on Earth today? More than a dozen
17. Where does old seafloor sink back into the Earth to be recycled? Mantle
19. How many years ago did the supercontinent Pangaea begin breaking up?
250 million years ago
[Show Less]
