What is the average thickness of oceanic lithosphere ? Does it increase over the ridges ?

I would like to know whether the thickness of the lithosphere increases beneath the oceanic ridges like the Ninety East Ridge in the Bay of BengalWhat is the average thickness of oceanic lithosphere ? Does it increase over the ridges ?
No, it actually decreases at the ridges. In fact, the thickness it zero at the spreading center by definition. The average thickness is about 6 km.What is the average thickness of oceanic lithosphere ? Does it increase over the ridges ?
The average thickness of the oceanic lithosphere is 5 km, and is composed mainly of basalt. The theory of plate tectonics describes areas of ocean crust formation like the mid Atlantic ridge and areas where oceanic crust is being subducted and recycled. Since during subduction one plate is being forced beneath the other so it is unavoidable that the crust will thicken.





The bay of Bengal is where the Indian plate and the Australian plate are colliding, this collision caused the quake and tsunami on 12/26/2004, this collision is also the reason for the multitude of volcanoes in the area and the formation of surrounding islands.
The increasing thickness of oceanic crust with distance from the ridge can be considered one proof that the earth is not ';young';. We can measure the thickness. We can measure the rate of spreading. We can show that older crust is thicker. We can also note the thickness of accumulated oceanic sediments. Older, thicker crust has more sediment on it. All of these separately point to an old erath.