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maddie willen

Discovery Channel :: Tsunami - 1 views

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    2004 Indian Ocean earth quake 
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kavi rawal

Tsunami and Earthquakes - 1 views

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    Science of Predicting monster waves
Aash Bhasin

Discovery Channel :: Earthquake: Make a Quake - 1 views

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    Discovery Channel | TLC | Animal Planet | Discovery Health | Science Channel | Planet Green Discovery Kids | Military Channel | Discovery News | Investigation Discovery | HD Theater | Turbo | FitTV HowStuffWorks | TreeHugger | Petfinder | PetVideo | Discovery Education Visit the Discovery Store: Toys & Games | Telescopes | DVD Sets | Planet Earth DVD | Gift Ideas By visiting this site, you agree to the terms and conditions of our Visitor Agreement.
Aey Chuaratanaphong

BBC News - Animated guide: Volcanoes - 0 views

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    No comment
Bprem simmonds

Tornadoes--Forces of Nature--Science, Maps, Photos, Video (National Geographic) - 0 views

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    what is a tornado
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    Tornados
Annabelle Cheng

BBC - GCSE Bitesize: Wegener's theory - 11 views

  • Alfred Wegener proposed the theory of continental drift at the beginning of the 20th century. His idea was that the Earth's continents were once joined together, but gradually moved apart over millions of years. It offered an explanation of the existence of similar fossils and rocks on continents that are far apart from each other. But it took a long time for the idea to become accepted by other scientists.Before Weg
  • Wegener suggested that mountains were formed when the edge of a drifting continent collided with another, causing it to crumple and fold. For example, the Himalayas were formed when India came into contact with Asia.
  • se the Earth was cooling down, and in doing so contracted. This was believed to form wrinkles, or mountains, in the Earth's crust. If the idea was correct, however, mountains would be spread evenly over the Earth's surface. We know this is not the case.
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  • Wegener’s evidence for continental drift was that: the same types of fossilised animals and plants are found in South America and Africathe shape of the east coast of South America fits the west coast of Africa, like pieces in a jigsaw puzzlematching rock formations and mountain chains are found in South America and Africa
  • nerBefore Wegener dev
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  • loped his theory, it was thoug
  • untains formed becau
    • Annabelle Cheng
       
      clear slideshow that explains wegener's theory
Rima Touya

What evidence did Alfred Wegener use to support his theory of continental drift - 18 views

  • Alfred Wegener's fully developed theory of continental drift attempted to point out evidences that the continents were once joined into a single continent he called Pangea. Wegener's theory hypothesized that the continents were able to push through the rock of the seafloor to their present positions. As evidence, he noted, as had others before him, of the geographic correlation in coastline perimeters of South America and Africa. This was the feature that led Wegener to investigate for other evidences. His investigations revealed that mountain ranges in South America and Africa, and strata and composition of coal fields in Europe and North America matched or lined up. Additionally, matching reptilian fossils were found on either side of the ocean, indicating that the continents were once joined together. Although he was unable to find a mechanism for his proposed continental drift theory, he also observed that the more shallow an ocean, the younger its geologic age. It wasn't until the 1950's and 1960's, with the discovery of the Mid-Atlantic Ridge, and other sea floor mapping discoveries that Wegener's hypothesis started to become more accepted. The newer science of plate tectonics owes much to Wegener's scientific groundwork.
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