NettetAround 60–50 Ma, when the hotspot was located near the eastern coast of Greenland and the Mid-Atlantic Ridge, volcanism, perhaps generated by the Iceland hotspot, … NettetThe East Pacific Rise is a mid-ocean rise (termed an oceanic rise and not a mid-ocean ridge due to its higher rate of spreading that results in less elevation increase and more regular terrain), a divergent tectonic plate …
atlantic plate tectonics widening gap europe america University …
NettetThe oldest sediments so far recovered by a variety of methods—including coring, dredging, and deep-sea drilling—date only to the Jurassic Period, not exceeding about 200 million years in age. Such findings are incompatible with the doctrine of the permanency of the ocean basins that had prevailed among Earth scientists for so many years. NettetPlate A has oceanic lithosphere on its leading edge that is 10 million years old. Plate B has oceanic lithosphere on its leading edge that is 200 million years old. Which plate will be subducted if they collide with each other, and why? Plate B will subduct because it is older—and therefore colder—and more dense. elevated co2 in bmp
How old are the rocks on the Mid Atlantic Ridge? – Sage-Answers
NettetMid-Atlantic Ridge. The Mid-Atlantic Ridge is the longest mountain chain on Earth. It runs along the Atlantic Ocean floor from North America to beyond the southern tip of Africa. It rises 2,000–4,000m (6,000–13,000ft) above the sea floor, and runs for 16,000km (10,000 miles). Beneath the ridge is a place of great volcanic activity. Nettet1. apr. 2010 · Very little of the sea floor is older than 150 million years. This is because the oldest sea floor is subducted under other plates and replaces by new surfaces. The tectonic plates are constantly in motion and new surfaces are always being created. This continual motion is evidenced by the occurrence of earthquakes and volcanoes. … NettetUse the above equation to calculate spreading rate. R = d/t or R = 9.5 * 107 cm / 6.5 * 107 years = 1.46 cm/yr. Notes: Ranges of Spreading throughout the world's oceans: 1cm/yr to 10 cm/yr. Measure from the center of the spreading center to a known age point on the plate rather than from 65 Ma on the eastern plate to 65 Ma on the western plate. elevated co2 levels in blood