Read e-book Continental Drift

Free download. Book file PDF easily for everyone and every device. You can download and read online Continental Drift file PDF Book only if you are registered here. And also you can download or read online all Book PDF file that related with Continental Drift book. Happy reading Continental Drift Bookeveryone. Download file Free Book PDF Continental Drift at Complete PDF Library. This Book have some digital formats such us :paperbook, ebook, kindle, epub, fb2 and another formats. Here is The CompletePDF Book Library. It's free to register here to get Book file PDF Continental Drift Pocket Guide.

He called his hypothesis continental drift.

Besides the way the continents fit together, Wegener and his supporters collected a great deal of evidence for the continental drift hypothesis. For one, identical rocks of the same type and age are found on both sides of the Atlantic Ocean.


  • Accessibility Navigation.
  • Fossils as Indicators of Continental Drift* | Nature!
  • Continental Drift - an overview | ScienceDirect Topics.
  • Result Filters.
  • A Science Odyssey: People and Discoveries: Wegener proposes idea of continental drift.
  • Legends of Southeast Indian Tribes.

Wegener said the rocks had formed side-by-side and that the land had since moved apart. Mountain ranges with the same rock types, structures, and ages are now on opposite sides of the Atlantic Ocean. Wegener concluded that they formed as a single mountain range that was separated as the continents drifted.

Continental Drift 101 - National Geographic

Ancient fossils of the same species of extinct plants and animals are found in rocks of the same age but are on continents that are now widely separated. Wegener proposed that the organisms had lived side by side, but that the lands had moved apart after they were dead and fossilized. He suggested that the organisms would not have been able to travel across the oceans. For example, the fossils of the seed fern Glossopteris were too heavy to be carried so far by wind.

The reptile Mesosaurus could only swim in fresh water.

Site Search Navigation

Cynognathus and Lystrosaurus were land reptiles and were unable to swim. Grooves and rock deposits left by ancient glaciers are found today on different continents very close to the equator.

Continental drift

Today glaciers only form on land and nearer the poles. Wegener thought that the glaciers were centered over the southern land mass close to the South Pole and the continents moved to their present positions later on. Coral reefs and coal-forming swamps are found in tropical and subtropical environments, but ancient coal seams and coral reefs are found in locations where it is much too cold today.

To his colleagues, his greatest problem was that he had no plausible mechanism for how the continents could move through the oceans. Based on his polar experiences, Wegener suggested that the continents were like icebreaking ships plowing through ice sheets. The continents moved by centrifugal and tidal forces. What observations would you expect to see on these continents? Figure 9. Early hypotheses proposed that centrifugal forces moved continents.

When Continental Drift Was Considered Pseudoscience

This is the same force that moves the swings outward on a spinning carnival ride. Scientists at the time calculated that centrifugal and tidal forces were too weak to move continents. When one scientist did calculations that assumed that these forces were strong enough to move continents, his result was that if Earth had such strong forces the planet would stop rotating in less than one year. In addition, scientists also thought that the continents that had been plowing through the ocean basins should be much more deformed than they are.

Wegener answered his question of whether Africa and South America had once been joined. But a hypothesis is rarely accepted without a mechanism to drive it. Are you going to support Wegener? Figure This rock then spreads out and cools, sinking back towards the core, where it can be heated again. This circulation of rock through the mantle creates convection cells. Wegener had many thoughts regarding what could be the driving force behind continental drift.


  • Cauchy3-Book 30-Poems?
  • High School Earth Science/Continental Drift.
  • Landlord Tales and other Short Stories.
  • When Continental Drift Was Considered Pseudoscience | Science | Smithsonian.
  • Learning in the Cloud: How (and Why) to Transform Schools with Digital Media!
  • Learn more about Continental Drift.
  • Continental Drift: Theory & Definition | Live Science.

In a convection cell , material deep beneath the surface is heated so that its density is lowered and it rises. Near the surface it becomes cooler and denser, so it sinks. Holmes thought this could be like a conveyor belt. Where two adjacent convection cells rise to the surface, a continent could break apart with pieces moving in opposite directions. Although this sounds like a great idea, there was no real evidence for it, either. Alfred Wegener died in on an expedition on the Greenland icecap. Answer the question s below to see how well you understand the topics covered in the previous section.

Use this quiz to check your understanding and decide whether to 1 study the previous section further or 2 move on to the next section. Skip to main content.

Continental Drift

Module 5: Plate Tectonics. Advanced Search. Author s. Arthur C. Munyan Arthur C. Google Scholar. Publication date:.

Wegener and his Theory of Continental Drift | SpringerLink

Front Matter. Add to Citation Manager. Old Dominion College, Norfolk, Virginia. Ernst R. Deutsch Ernst R. Runcorn S. Horacio J.


  • My Chimericon (Crystal Men Book 3)!
  • Lost and Found.
  • Polar Wandering and Continental Drift | GeoScienceWorld Books | GeoScienceWorld.
  • Murder in the Métro: Laetitia Toureaux and the Cagoule in 1930s France.
  • Breadcrumb?

Harrington Horacio J.