1. Climate gets colder, and precipitation falls as snow. Glaciers form, meaning less water returns to the sea, causing a fall in sea levels.
2. The weight of ice causes the land to sink. Although the sea levels are low, they are fairly high in relation to the height of the land.
3. Temperature increases again, meaning ice masses melt, replenishing the main water store. Sea levels rise, and precipitation falls as rain. Submergent land features occur here such as rias and fjords.
4. As there is less weight on the land, isostatic rebound occurs, and the land moves up to previous levels. Sea levels remain high, altough they are quite low in relation to the land height. Emergent land features such as raised beaches form here.
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