New Sea Floor Increases Earth Surface

If spreading continues past the incipient stage described above two of the rift arms will open while the third arm stops opening and becomes a failed rift or aulacogen.

New sea floor increases earth surface. What is the name of this process. The entire crust occupies just 1 of the earth s volume. Mantle convection is the slow churn ing motion of earth s mantle. Features rising up from the ocean floor include seamounts volcanic islands and the mid oceanic ridges and rises.

Scaling the tallest mountain on earth would take you not to mt. When the magma cools to form rock its magnetic polarity is aligned with the then current positions of the magnetic poles of the earth. They have discovered a vast mountain range which encircles the entire globe. Hess theory was that new seafloor is formed when magma is forced upward toward the surface at a mid ocean ridge.

Continental crust is mainly composed of granite a light. Seafloor spreading is a geologic process in which tectonic plate s large slabs of earth s lithosphere split apart from each other. Answered sea floor spreading creates new sea floor but the diameter of the earth doesn t increase because another process melts old sea floor back into magma. Here new sea floor is being continuously formed as the earth s surface splits apart.

Third of the ocean floor and extends for about 60 000 km around the earth. New magma then forces the older cooled magma away from the ridge. Mid ocean ridge system 28 elevation of earth s surface displays a bimodal distribution with about 29 above sea level and much of the remainder at a depth of 4 to 5 kilometers below sea level. Seafloor spreading and other tectonic activity processes are the result of mantle convection.

Below the ocean floor there are a few small deeper areas called ocean trenches. Although this peak reaches only 13 803 feet above sea level the mountain extends another 19 700 feet below the surface for a total of 33 500 feet from base to summit at 29 035 feet mt. Everest but to mauna kea on the big island of hawaii. Only in the past fifty years have scientists begun to explore in detail this vast region revealing beneath the waves a landscape quite unlike the world we are used to.

Sea floor spreading is were the earths crust is spreading under the ocean going almost all the way around the earth there are also volcanoes where the sea floor spreading because of the magma. The temperature of the crust increases as you go deeper into the earth. The ocean floor is called the abyssal plain.