Continental Drift Ch10
Terms in this set (27)
The huge landmass that broke apart and formed today's continents. North of the equator it was called Laurasia and south of the equator it was called Gondwanaland.
Portion of Earth that lies beneath the ocean.
Harry Hess's theory that new seafloor is formed at the midocean ridge when magma is forced up to the surface
What was Wegener's climatic evidence?
He found glacial evidence which is now desert, but was once tropical.
How did fossils help summarize Wegner's hypothesis of continental drift?
The fossils are of animals that could not swim or fly.
List four pieces of evidence for Wegener's hypothesis of continental drift?
Continents fit like a puzzle, climate clues, fossil clues, and rock layers or formations.
What was the name of the reptile that Wegners found in both South America and Africa?
What was the name of the tropical fern found in Africa, Australia, India, South America, and Antarctica?
What mountain range in the Eastern U.S. did Wegner indicate appeared to continue in Europe?
The Appalachian Mountains.
What did Wegner call the movement of continents?
What is the evidence that Africa was once colder?
How did the glossopteris support Wegner's evidence of continental drift?
The glossopteris was found at the bottom of Antarctica, which could not possibly support tropical plants.
The theory of seafloor BLANK says that BLANK material beneath the crust at the BLANK ridge is forced up and moves away from the BLANK.
Seafloor BLANK says that rock from the rift moves away from the rift and that the seafloor away from the rift is BLANK.
Seafloor spreading says that the rock that is closest to the BLANK is BLANK than the rock that is further away.
Alfred W. was one of the first geologists to hypothesize that all of the BLANK were joined together in the past to form one single landmass called BLANK.
Wegener's hypothesis used fossils found in South America and BLANK.
Similar BLANK formations exist in the Appalachian Mountains and in Greenland and Western Europe. Until Harry Hess theory of seafloor BLANK, scientists could not think of how the continents moved.
The fact that Wegener could not provide the BLANK that moved the continents resulted in the rejection of the hypothesis.
When the word mechanism is used, it means that Wegener could not provide the BLANK that moved the continents.
Meteorologist responsible for Continental Drift.
Navy Geologist responsible for Seafloor spreading
Geologist who worked with Harry Hess in seafloor spreading.
When the earth's magnetic field points north.
When the earth's magnetic field points south instead of north.
When one side of the rift shows normal polarity, the other equal side, of the same age, must show normal polarity, too.
The earth's magnetic field
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