Before you answer the questions, read the publication “This Dynamic Earth”.

  1. Before you answer the questions, read the publication “This Dynamic Earth”.

2.Choose any 3 of the 8 topics/questions below and answer the related questions in the appropriate thread of this Discussion.

  1. Q.1 Distribution of Volcanoes: Why most volcanoes in the world (95%) are located along mid-oceanic ridges or found in chains parallel to trenches?
  1. Q.2: Sea-floor topography: Why are trenches bordering chains of volcanoes and island arcs? What happens at trenches? How do oceanic ridges form?

6.

  1. Q. 3 Ocean floor age: Why the ocean floor is progressively older as you move away from the oceanic ridge? Why there is no ocean floor on Earth older than ~ 200 million years?

8.

  1. Q. 4: Ocean floor magnetization: Explain the origin of the magnetization pattern of the ocean floor.

10.

  1. Q. 5: Distribution of earthquakes: Why earthquakes occur only in narrow zones of the Earth (i.e. mid-oceanic ridges and trenches)?

12.

  1. Q. 6: Distribution of Mountain Ranges: Why large mountain ranges are also located in such zones? What caused these mountains to form?

14.

  1. Q. 7 Wegner’s arguments: How does plate tectonics confirm the evidence and theory of continental drift that Alfred Wegner proposed?Why the continents seem to match up like in a puzzle?Why are fossils of long-extinct animals found on different continents? Why rocks bordering the continents around the Atlantic Ocean have the same age, composition and geologic structures? How can the puzzling pattern of glacial striations on different continents in the south hemisphere be explained? How can we explain the occurrence of Paleozoic glacial deposits near the equator only in some continents?

16.

  1. Q. 8: Hot spots: What is the origin of chain of sea mounts and volcanic islands that display a straight alignment and a regular age progression from older to younger?
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