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2021-05-15

Why was the theory of continental drift rejected at first?

Why was the theory of continental drift rejected at first?

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 was the major problem with Wegener’s theory of continental drift?

The greatest problem facing Wegener was the lack of direct evidence for the movements of continents (no GPS at the time!) and no mechanism was known to be powerful enough to move entire continents.

When was Wegener’s theory accepted?

1915

What was Wegener wrong about?

Wegener thought that the continents were moving through the earth’s crust, like icebreakers plowing through ice sheets, and that centrifugal and tidal forces were responsible for moving the continents. We now know that Wegener’s theory was wrong in one major point: continents do not plow through the ocean floor.

How old is the oldest oceanic crust on Earth?

about 340 million years

What continents does the Mid Atlantic Ridge is pushing away from each other?

The North American and Eurasian Plates are moving away from each other along the line of the Mid Atlantic Ridge. The Ridge extends into the South Atlantic Ocean between the South American and African Plates.

Why are the UK and us moving further apart?

Researchers say the tectonic plates on which the continents of North and South America lie are moving apart from the Eurasian and African plates – essentially meaning Britain and America are getting further apart.

What is the Mid-Atlantic Ridge and why is it important?

Mid-ocean ridges are geologically important because they occur along the kind of plate boundary where new ocean floor is created as the plates spread apart. Thus the mid-ocean ridge is also known as a “spreading center” or a “divergent plate boundary.” The plates spread apart at rates of 1 cm to 20 cm per year.

Which of the two ridges has the deepest and longest Rift Valley?

Mid-Atlantic Ridge

Which location is on a major rift valley?

The most well-known rift valley on Earth is probably the so-called “Great Rift Valley System” which stretches from the Middle East in the north to Mozambique in the south. The area is geologically active, and features volcanoes, hot springs, geysers, and frequent earthquakes.

Is a rift valley convergent or divergent?

Areas where plates are colliding form convergent boundaries, and areas where plates are expanding create divergent boundaries. Rift valleys are formed by divergent boundaries that involve continental plates.