- Who among the following coined the term seafloor spreading in 1961?
- What causes convection?
- Why was Wegener’s theory not accepted?
- When did Arthur Holmes die?
- How did Arthur Holmes define conventional current theory?
- When was Wegener’s theory accepted?
- What is convection theory?
- What was Arthur Holmes famous for?
- Why did Alfred Wegener’s theory get rejected?
- What evidence did Hess use in his theory of seafloor spreading?
- Who proposed the theory of seafloor spreading?
- What is Convectional current theory?
- What did Arthur Holmes discover?
- Who introduced the conventional current theory?
- What is mantle convection theory?
- What is convection in Earth’s mantle?
- What did Arthur Holmes suggest in 1928?
- How did Arthur Holmes prove Wegener’s theory?
- Where is New seafloor created?
- Who proposed Pangea?
- Why was Pangea not accepted?
Who among the following coined the term seafloor spreading in 1961?
During the 1950’s and 1960’s, Dietz was an advocate for both the motion of the sea floor and later Sea Floor Spreading, a term he coined in his 1961 Nature article entitled Continent and Ocean Basin Evolution by Spreading of he Sea Floor..
What causes convection?
Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.
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.
When did Arthur Holmes die?
September 20, 1965Arthur Holmes/Date of death
How did Arthur Holmes define conventional current theory?
Holmes theorized that convection currents move through the mantle the same way heated air circulates through a room, and radically reshape the Earth’s surface in the process.
When was Wegener’s theory accepted?
Wegener first presented his theory in lectures in 1912 and published it in full in 1915 in his most important work, Die Entstehung der Kontinente und Ozeane (The Origin of Continents and Oceans).
What is convection theory?
Heat energy transfers between a solid and a fluid when there is a temperature difference between the fluid and the solid. This is known as “convection heat transfer”. … This is known as “natural convection” and it is a strong function of the temperature difference between the solid and the fluid.
What was Arthur Holmes famous for?
Arthur Holmes (1890-1965) was an English geologist who made two important contributions to the development of geological ideas: the use of radioactive isotopes for dating minerals and the suggestion that convection currents in the mantle play an important role in continental drift.
Why did Alfred Wegener’s theory get rejected?
Wegener’s inability to provide an adequate explanation of the forces responsible for continental drift and the prevailing belief that the earth was solid and immovable resulted in the scientific dismissal of his theories.
What evidence did Hess use in his theory of seafloor spreading?
Hess in 1960. On the basis of Tharp’s efforts and other new discoveries about the deep-ocean floor, Hess postulated that molten material from Earth’s mantle continuously wells up along the crests of the mid-ocean ridges that wind for nearly 80,000 km (50,000 miles) through all the world’s oceans.
Who proposed the theory of seafloor spreading?
Harry HessSea-floor spreading — In the early 1960s, Princeton geologist Harry Hess proposed the hypothesis of sea-floor spreading, in which basaltic magma from the mantle rises to create new ocean floor at mid-ocean ridges.
What is Convectional current theory?
According to this theory, the intense heat generated by radioactive substances in the mantle (100-2900 km below the earth surface) seeks a path to escape and gives rise to the formation of convection currents in the mantle.
What did Arthur Holmes discover?
Arthur Holmes began studying physics at the Imperial College of Science in London, but switched to geology before graduating in 1910. In 1913, before he even earned his doctoral degree, he proposed the first geological time scale, based on the fairly recently discovered phenomenon of radioactivity.
Who introduced the conventional current theory?
Arthur Holmes postulated convection current theory in the year 1928–29. It is widely accepted driving mechanism for Continental drift(moving apart) which lead to the foundation of modern plate tectonics. His main objective was to find the scientific explanation of origin of the Continent and oceans.
What is mantle convection theory?
Definition. Mantle convection: Thermal convection in the terrestrial planetary mantles, the rocky layer be- tween crust and core, in which hot material rises, cold material sinks and the induced flow governs plate tectonic and volcanic activity, as well as chemical segregation and cooling of the entire planet.
What is convection in Earth’s mantle?
Mantle convection is the very slow creeping motion of Earth’s solid silicate mantle caused by convection currents carrying heat from the interior to the planet’s surface. … This hot added material cools down by conduction and convection of heat.
What did Arthur Holmes suggest in 1928?
Continental drift One problem with the theory lay in the mechanism of movement, and Holmes proposed that Earth’s mantle contained convection cells that dissipated radioactive heat and moved the crust at the surface. His Principles of Physical Geology ended with a chapter on continental drift.
How did Arthur Holmes prove Wegener’s theory?
Holmes advocated the theory of continental drift fostered by Alfred Wegener at a time when it was profoundly unfashionable with conformist. … Holmes’s hypothesis not only produced a mechanism by which the continents could move, it also provided a probable explanation for continental rifting and mountain formation.
Where is New seafloor created?
Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
Who proposed Pangea?
scientist Alfred WegenerMore than a century ago, the scientist Alfred Wegener proposed the notion of an ancient supercontinent, which he named Pangaea (sometimes spelled Pangea), after putting together several lines of evidence.
Why was Pangea not accepted?
Despite having this geological and paleontological evidence, Wegener’s theory of continental drift was not accepted by the scientific community, because his explanation of the driving forces behind continental movement (which he said stemmed from the pulling force that created Earth’s equatorial bulge or the …