Question
How have deep sea ridges been formed ? (
Solution
Deep sea ridges are elongated high features on the floors of the oceans. These ridges are either broad, gently sloping rises or steep sided narrow sub-marine mountains. The summits of the submarine ridges rise above sea level forming islands such as Andaman group of islands.
Formation : The submarine ridges are formed by the following processes :
(1) Large outpouring of basalt along-fissure line.
(2) Rising of the crust by the rising convection currents.
(3) Thickening and buckling of the basaltic crust by the downward movement of the convectional currents.
(4) Formation of new oceanic crusts.
