What happend to the oceans when thick sheets of ice covered te land?

When thick ice sheets covered the land during ice ages, sea levels dropped because much of the Earth's water was locked up in ice. This exposed more land, including parts of the ocean floor, creating land bridges between continents like the famous Bering Land Bridge between Asia and North America. Ocean currents and temperatures changed, affecting weather patterns and marine life. Nutrient flows in the oceans also altered, impacting the food chains. As the ice melted at the end of ice ages, sea levels rose again, submerging these bridges and reshaping Coastlines and marine environments.