1. What do you call the idea proposed by Alfred Wegener to explain the continental shapes and their positions?
2.which two are the best examples of different continental positions in the past?
A North America – South America
B South America – Asia
C North America – Africa
D South America – Africa
3.What did the scientists in the mid-1900s used to map mid-ocean ridges?
4.Early observers thought continents might have been joined based on what observation?
5.Why did the peer scientists, reviewing Wegener's hypothesis of continental drift, rejected his notion?
6.What helps explain why Earth is not getting any larger even though the tectonic plates are always moving?
7.If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?
8.What do ancient glacier scars, found in rock surfaces in Africa, tells about its climate in the past?
9.What is the Seafloor Spreading Theory? It states that
10.What can you say about the rate of movement of materials coming out from the mid-oceanic ridge and the materials sinking in the subduction zone?
2.which two are the best examples of different continental positions in the past?
A North America – South America
B South America – Asia
C North America – Africa
D South America – Africa
3.What did the scientists in the mid-1900s used to map mid-ocean ridges?
4.Early observers thought continents might have been joined based on what observation?
5.Why did the peer scientists, reviewing Wegener's hypothesis of continental drift, rejected his notion?
6.What helps explain why Earth is not getting any larger even though the tectonic plates are always moving?
7.If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?
8.What do ancient glacier scars, found in rock surfaces in Africa, tells about its climate in the past?
9.What is the Seafloor Spreading Theory? It states that
10.What can you say about the rate of movement of materials coming out from the mid-oceanic ridge and the materials sinking in the subduction zone?
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Answer:
1.Contenial Drift
2.South America - Africa
3.In the mid-1900s, scientists mapped the mid-ocean ridges using
sonar.
4.Coastline
5.hypothesis was not accepted was because he suggested no mechanism for moving the continents.
6.New crust is continually being pushed away from divergent boundaries.
7.Increased seafloor spreading.
8.The ancient glacier scars found in rock surfaces in Africa tells us that the continent was once in an area of the Earth that had a very cold climate, hence.
9.mid-ocean ridge system
10.The rising of the materials from the ridge are faster than in the subduction
zone.
Explanation:
1.Continental drift was a theory that explained how continents shift position on Earth's surface.
2.I'm not sure po
3.Sonar is a device that bounces sound waves off underwater objects and then records the echoes of these sound waves. The mid-ocean ridges curve along the sea floor, extending into all of Earth's oceans.
4.Early observers thought that the continents might have been joined based on the observation that their coastlines look similar
5.He thought the force of Earth's spin was sufficient to cause continents to move, but geologists knew that rocks are too strong for this to be true.
6.Deep below the Earth's surface, subduction causes partial melting of both the ocean crust and mantle as they slide past one another.
7.means that the mid-ocean ridge will then expand and form a broader ridge with decreased average depth, taking up more space in the ocean basin.
8.More than 200 million years ago, when Pangaea started breaking up, Africa was still connected with South America, India, Antarctica, and Australia, forming the continent Gondwanaland.
9.seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them.
10.not sure po
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