Question: What Did Harry Hess Contribute To The Theory Of Plate Tectonics?

Who is Harry Hess and what did he do?

Harry Hess was a geologist and Navy submarine commander during World War II.

Part of his mission had been to study the deepest parts of the ocean floor.

In 1946 he had discovered that hundreds of flat-topped mountains, perhaps sunken islands, shape the Pacific floor..

What are the evidence of the continental drift theory?

The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.

What evidence supports the theory of ocean floor?

Several types of evidence supported Hess’s theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves. This evidence led scientists to look again at Wegener’s hypothesis of continental drift.

What is the first step of seafloor spreading?

A crack forms in oceanic crust. Molten rock rises up through oceanic crust. Molten rock solidifies at the center of the ridge.

Which accurately states the plate tectonic theory?

The theory of plate tectonics states that the Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.

What is the theory of seafloor spreading?

Seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them. …

What did Alfred Wegener use as evidence for his theory that the continents were once one giant land mass?

Evidence for continental drift Wegener knew that fossil plants and animals such as mesosaurs, a freshwater reptile found only South America and Africa during the Permian period, could be found on many continents. He also matched up rocks on either side of the Atlantic Ocean like puzzle pieces.

Who is Harry Hess How were his discoveries contributed to the theory of plate tectonics?

His time as a Navy officer was an opportunity to use sonar (also called echo sounding), then a new technology, to map the ocean floor across the North Pacific. He published ‘The History of Ocean Basins’ in 1962, in which he outlined a theory that could explain how the continents could actually drift.

What contribution did Harry Hess make to our understanding of the Earth?

In 1962, he proposed a groundbreaking hypothesis that proved vitally important in the development of plate tectonic theory. It addressed several geologic puzzles: If the oceans have existed for at least 4 billion years, why has so little sediment accumulated on the ocean floor?

Which scientists contributed to the theory of plate tectonics?

The “Father of Plate Tectonics”, Alfred Wegener proposed “Continental Drift” in 1912, but was ridiculed by fellow scientists. It would take another 50 years for the concept to be accepted.

Which layer of Earth is made up of plates?

lithosphereThe crust and the upper part of the mantle make up the lithosphere, which is broken into plates, both large and small.

Why is the theory of plate tectonics still considered a theory even with the evidence collected to support it?

Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.