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hardens to form new rock at mid-ocean ridges
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Restless Continents Flashcards | Quizlet – Magma rises towards the surface and solidifies in the cooler upper regions. Then, as the tectonic plates move apart from each other at the mid-ocean ridges, new magma rises to fill the gap. As this new crust forms, older crust is pushed outward, away from the mid-ocean ridges. process that takes place at mid-ocean ridgesThis substance hardens to form new rock at mid-ocean ridges.New rock is added to the ocean floor by the process of seafloor spreading, in which the magma is pushed out of the mantle, and is cooled by the water. Creating a new layer of hard rock.
Restless Continents 1.8 | Earth Sciences Quiz – Quizizz – Hardens to form new rock at mid-ocean ridges? Sea- Floor Spreading molten material erupts through the valley that runs along the center of some mid-ocean ridges. This material hardens to form the…Once formed in the deep crust, basalt magma wants to rise, and at the center of the mid-ocean ridge, it oozes onto the seafloor, where it rapidly solidifies in the ice-cold water in the form of lava pillows. Farther down, basalt that doesn't erupt hardens in dikes, stacked vertically like cards in a deck.The mid-ocean ridge is the most extensive chain of mountains on Earth, stretching nearly 65,000 kilometers (40,390 miles) and with more than 90 percent of the mountain range lying in the deep ocean. The nearly continuous, global mid-ocean ridge system snakes across the Earth's surface like the seams on a baseball.
How is new rock added to the ocean floor? – Answers – Mid-ocean ridges. Where does sea-floor spreading take place. Global positioning system (gps) Is used to measure the movement of tectonic plates. Magma. Hardens to form new rock at mid-ocean ridges. Seismograph. Used to measure the of the earths layers. Magnetic reversal. Used as evidence for continental drift.As new crust forms at mid-ocean ridges, tiny grains of magnetic minerals align themselves according to the Earth's magnetic field. As the rock cools, the alignment of these grains becomes permanent and provides evidence of the polarity of the Earth's magnetic field at the time of their formation. What are mid-ocean ridges?Much of the magma eventually freezes in place there within the crust, forming the bulk of the new oceanic crust without erupting at all. Average oceanic crust is about 10km thick, but only the upper 1 to 3 km are formed by eruption processes. When magma pressure builds up enough to force its way out to the seafloor, eruption occurs.