Hwta Is Not Sea Floor Spreading

Seafloor spreading is a geologic process where there is a gradual addition o.

Hwta is not sea floor spreading.

Hess its major tenets gave great support to the theory of continental drift continental drift geological theory that the relative positions of the continents on the earth s surface have. The new rock is dense but not as dense as the old rock that moves away from the ridge. A molten magma constantly erupting b drilling samples of rock c fossil evidence d magnetic stripes 1 see answer nathalia51 nathalia51 answer. The sea floor spreading hypothesis was first formulated by hess 1960 1962 the mid ocean ridges which are characterized by unusually high heat flow along their crests are the largest topographic features on the surface of the earth.

Rapidly spreading ridges have a much more gentle slopes. When the molten magma reaches the oceanic crust it cools and pushes away the existing rocks from the ridge equally in both directions. The mid atlantic seafloor is spreading yes but the north american plate is subducting under the pacific plate in california. In international geophysics 2000.

Seafloor spreading is not consistent at all mid ocean ridges. The mid atlantic ridge for instance is a slow spreading center. Which is not an evidence of sea floor spreading. The sea floor is spreading in one area but in another area the plates are subducting under one another.

Slowly spreading ridges are the sites of tall narrow underwater cliff s and mountains. 5 1 1 sea floor spreading and plate tectonics. Since the new oceanic basins are shallower than the old oceanic basins the total capacity of the world s ocean basins decreases during times of active sea floor spreading. There is no connection between the fossils of the animals to the sea floor spreading.

The differences in spreading rates affect not only the geometries of the ridges but also the geochemistry of the basalts that are produced. Wherever continents are bordered by deep sea trench systems as in the pacific ocean the ocean floor is plunged downward underthrusting the continents and ultimately reentering and dissolving in earth s mantle from which it had originated. A younger oceanic crust is then formed causing the spread of the ocean floor. For every inch gained in the atlantic an inch is lost in california.

Seafloor spreading theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. 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. The movement of these two tectonic plates is still ongoing albeit at a slow pace and geologists believe that after millions of years africa and asia will completely be separated at the.