What are the evidence of continental drift theory?

What are the evidence of 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.

When did Arthur Holmes discover continental drift?

1930
Around 1930, Holmes suggested a mechanism that could explain Alfred Wegener’s theory of continental drift: the power of convection.

What according to Arthur Holmes is the cause of heat within the Earth which causes convection currents?

The driving force of mountain building implied by Arthur Holmes is provided by thermal convection currents originating deep within the earth. The main source of the origin of convective currents is excessive heat in the substratum wherein disintegration of radioactive elements generates heat regularly.

Why did Arthur Holmes make the geologic time scale?

Arthur Holmes (1890-1965) was a British geoscientist who devoted much of his academic life to trying to further the understanding of geology by developing a radiometric timescale. From an early age he held in his mind a clear vision of how such a timescale would correlate and unify all geological events and processes.

What is Holmes 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.

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”. The temperature of the solid due to an external field such as fluid buoyancy can induce a fluid motion.

How does Arthur Holmes describe the idea of thermal convection?

Why do continents drift apart?

Wegener suggested that perhaps the rotation of the Earth caused the continents to shift towards and apart from each other. Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics.

What is the premise of drift theory?

Drift theory recognizes that juvenile delinquents hold conventional values and attitudes; they are aware that their delinquent actions are viewed by society as deviant. To nullify these conventional values and beliefs, juvenile delinquents learn techniques of neutralization.

How did Arthur Holmes contribute to continental drift?

In 1928, Arthur Holmes provided proponents of continental drift theory with an auxiliary hypothesis which afforded them a badly needed account of the forces responsible for continental drift.

How did Alfred Wegener contribute to the theory of continental drift?

Holmes advocated the theory of continental drift fostered by Alfred Wegener at a time when it was profoundly unfashionable with conformist. One problematic concern with the theory was the mechanism of movement, which Holmes advised that Earth’s mantle contained convection cells that dissipated radioactive heat and moved the crust at the surface.

What did Arthur Holmes think about mantle convection?

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. He proposed that upward convection might lift or even rupture the crust, that lateral movement could propel the crust sideways like a conveyor belt,

What did Arthur Holmes contribute to the age of the Earth?

The main issue raised by many scientists is the mechanism by which the continents could move. Holmes major contribution was the hypothesis that the radioactive decay occurring in the mantle of Earth would generate heat, and thereby convection currents that would be the means by which the continents could move.