Who proposed the theory of continental drift?

Who proposed the theory of continental drift?

scientist Alfred Wegener

Who is the father of continental drift?

Alfred Wegener

Which of the following was the single supercontinent which existed before individual continents broke apart from it a quarter of a billion years ago?

Pangaea The supercontinent that existed from about 300 to 200 million years ago and was composed of all of the major continents seen today, squished together.

What does the theory of continental drift state?

Continental drift was a theory that explained how continents shift position on Earth’s surface. Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents.

Why was the continental drift theory rejected?

The main reason that Wegener’s hypothesis was not accepted was because he suggested no mechanism for moving the continents. 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.

What evidence did Wegener use in his continental drift theory?

Wegener supported his theory by demonstrating the biological and geological similarities between continents. South America and Africa contain fossils of animals found only on those two continents, with corresponding geographic ranges.

Why is the Continental Drift Theory important?

Continental drift, large-scale horizontal movements of continents relative to one another and to the ocean basins during one or more episodes of geologic time. This concept was an important precursor to the development of the theory of plate tectonics, which incorporates it.

What is Pangea theory?

German meteorologist Alfred Wegener first presented the concept of Pangea (meaning “all lands”) along with the first comprehensive theory of continental drift, the idea that Earth’s continents slowly move relative to one another, at a conference in 1912 and later in his book The Origin of Continents and Oceans (1915).

What evidence did Alfred use?

He used fossil evidence, such as that of tropical plants found on the Arctic island of Spitzbergen. He found large-scale geographic features that matched, like the Appalachian Mountains in the United States and the Scottish Highlands, as well as rock strata in South Africa that matched those in Brazil.

What are 3 pieces of evidence for the theory of seafloor spreading?

Look at Figure 19 to see the process of sea-floor spreading. Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material, magnetic stripes, and drilling samples. This evidence also led sci- entists to look again at Wegener’s theory of continental drift.

What is the cause of seafloor spreading?

Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.

What are the 4 steps of seafloor spreading?

What are the 4 steps of seafloor spreading?

  • Magma comes out of the rift valley.
  • Magma cools to rock and hardens.
  • Rock is pushed away as new rock is formed at MOR.
  • Oceanic crust and continental crust meet at the trench.
  • Oceanic crust bends down under the continental crust.
  • Gravity pulls rock towards mantle.
  • Rock melts to mantle.

Who discovered seafloor spreading?

Harry Hess

What is the seafloor made of?

Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment. The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase [feldspar] and pyroxene).


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