To him, the presence of identical fossil species along the coastal parts of Africa and South America was the most compelling evidence that the two continents were once joined.
Were Africa and South America connected?
According to plate tectonic evidence, Gondwana was assembled by continental collisions in the Late Precambrian (about 1 billion to 542 million years ago). … The South Atlantic Ocean opened about 140 million years ago as Africa separated from South America.
How South America and Africa fit together?
The east coast of South America and the west coast of Africa seem to fit together like pieces of a jigsaw puzzle, and Wegener discovered their rock layers “fit” just as clearly. South America and Africa were not the only continents with similar geology.
Which of the following is not evidence that South America and Africa were once joined?
Which of the following is not evidence that South America and Africa were once joined? A deep trench and a volcanic island arc.
Who discovered South America in 1500?
Pedro Álvares Cabral (1467-1520) was a Portuguese nobleman, explorer, and navigator who discovered Brazil on April 22,1500. His patron was King Manuel I of Portugal, who sent him on an expedition to India. Cabral’s 13 ships left on March 9, 1500, following the route of Vasco da Gama.
Why was Wegener’s theory not accepted?
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.
Are continents floating?
The continents do not float on a sea of molten rock. … Under the continents is a layer of solid rock known as the upper mantle or asthenosphere. Though solid, this layer is weak and ductile enough to slowly flow under heat convection, causing the tectonic plates to move.
What is evidence that Africa was once cold?
Proof that shows Africa was once cold includes evidence of glacier scars and deposits.
Did South America break off from Africa?
Between about 170 million and 180 million years ago, Gondwana began its own split, with Africa and South America breaking apart from the other half of Gondwana. About 140 million years ago, South America and Africa split, opening up the South Atlantic Ocean between them.
What was Arthur Holmes theory?
Years before the scientific community accepted Alfred Wegener’s theory of continental drift, Holmes hypothesized (correctly) how it could have happened—through slow-moving convection currents in the Earth’s mantle which, he suggested, could force the continents toward or away from one another, creating new ocean floors …
Why did Pangea break up?
During the Triassic Period, the immense Pangea landmass began breaking apart as a result of continental rifting. A rift zone running the width of the supercontinent began to open up an ocean that would eventually separate the landmass into two enormous continents.