What causes sea level to drop?

Question

How about rise? I am looking for geological processes

Answer 1

The most obvious cause of a change in sea level is the amount of water locked up in polar ice. For example, with Global Warming and melting ice caps the UN's latest estimate is that sea levels will rise by somewhere between 17 and 34 inches by the year 2100.

Geological events that alter sea level will be more to do with changing the shape of the ocean bed. For example an earthquake which raises the ocean floor by 2 feet will raise the sea by the same amount. Obviously this would only occur if all the Worlds ocean floors were raised but the raising of one area of sea floor will raise the average sea level, if only by a tiny amount. Over long periods of time this could add up to a significant alteration is sea level. Similarly, a drop in level of the ocean floor would provide a greater volume in which was contained the same amount of sea water to the sea level would fall.

Similar effects would be seen for the growth of under-sea volcanos, tectonic movements reducing the overall volume of the ocean bed, or landslides from the land into the sea, all of which would increase sea level by displacing the water.

Sea level would fall by tectonic movements which increased the available volume of ocean floor, the destruction of volcanos by catastrophic explosion such as at Krakatoa or the sea breaking into new low-lying areas of land by erosion of coastal barriers (either natural or man-made)

Answer 2

"that's elementary to confirm in case you place a gaggle of ice in a tumbler of water and watch for it to soften; the glass is merely no longer as finished." have you ever tried this? The water point would be precisely the place it replaced into. the quantity of water displaced by way of the floating iceberg is strictly equivalent to the quantity of watertied up as ice interior the iceberg. Melting ice on land, because of the fact the different solutions say, promptly upload water to the sea. additionally, in a roundabout way, the land below the ice undergoes uplift, displacing yet greater water to different aspects of the planet.

Answer 3

Tides