of are examples of small circles.

Tenure of leavers can be described as the proportion of people who remained in their jobs for a certain amount of time before leaving (for example the percent who leave before completing 6 months of employment).

The Seafloor Spreading Hypothesis

Examples of carnivores include flies, various species of vultures, crabs, and hyenas.

The seafloor spreading hypothesis brought all ..

All of the early evidence for continental drift came from the continents. But if the continental crust moved, then the ocean crust must also move also. Evidence for the movement of the seafloor came from a hypothesis by Harry Hess of Princeton University.

the seafloor spreading hypothesis.

In 1915, Wegener proposed his continental drift theory. He said that the continents floated atop the mantle-a heavier, denser layer of rocks deep within the earth. Wegener predicted that heat rising within the hot mantle created currents of partially melted rocks that could move the continents around the earth’s surface.

Like many revolutionary theories, Wegener’s was not initially accepted by scientists. The “good fit” of the continents and the fossil and rock evidence did not provide enough proof. For decades afterward, scientists still did not understand how massive continents could be transported across the face of the Earth, and they had no evidence of any process that could cause continents to move.

In the 1950s and 1960s, marine geologists such as Bruce Heezen, Marie Tharp, and Henry Menard used data from echo sounders to map ocean ridges in the North Atlantic and the Pacific. They noticed first that these ridges stretched on for thousands of kilometers in long, continuous mountain chains that wound around the Earth’s surface, almost like the stitches on a baseball. The scientists also observed that the crest of the ridges had a topography that closely resembled volcanic rift zones on land. At their crests, they had V-shaped central valleys with steep faults on either side. This evidence led early marine geologists to deduce that the mid-ocean ridges were formed by seafloor volcanoes.

For example, the mixing of carbon dioxide and water can form carbonic acid.
For example, number, size, color, volume, and temperature may be some of the perceived characteristics of clouds in the atmospheric system.

How do modern scientists measure the rate of seafloor spreading?

The San Andreas fault system in California is well-studied example of a transform plate margin and forms the boundary between the Pacific and North American plates. As the system evolved, part of coastal California has been "captured" by the Pacific plate and as a result the Los Angeles region (which is on the Pacific plate) is moving towards the San Francisco region (which is on the North American plate) at about four centimeters per year.

This evidence led scientists to look again at Wegener’s hypothesis of continental drift

Describe the Sea Floor Spreading hypothesis

The alternating patterns were symmetric about bathymetric ridges that were recently mapped and known encircled the globe. As work continued on both polarity reversals and mapping the magnetic patterns on the floor, scientists figured out that one way to explain the observations was to have a process where ocean crust was formed along the ridges moved out in a conveyor-belt like fashion. This "sea-floor spreading" hypothesis explained the observations and linked the measurements on volcanic rocks on land and the observations in the ocean crust.

Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart

Describe Wegener’s hypothesis of ..

Sea-floor spreading occurs where oceanic plates are diverging from one another. Plates are huge slabs into which the crust as well as the upper part of the mantle (the intermediate zones between the Earth’s crust and core) is divided. As the plates move apart, the rocks break and form a crack between the plates. occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano. Magma is a very hot, molten rock which is formed within the earth by partial melting of the mantle. As a result, the age of the rocks increases as one move away from the rift-zone (place where the earth’s crust is pulled apart). The mid-oceanic ridge is the primary site for sea-floor spreading. and volcanoes are where sea-floor spreading occurs.