evidence: - Be aware that the ice in the water will melt faster than the ice on the "land." [...] Icebergs and frozen seawater also melt in warm temperatures but are not significant contributors to sea level rise. This is because they are already in the water. The volume of water they displace as ice is about the same as the volume of water they add to the ocean when they melt. As a result, sea level does not rise when sea ice melts. While density differences between salt water and freshwater result in a difference between the volume of salty sea water being displaced by sea ice and the freshwater that would result from the melting of that sea ice, it is minimal and beyond the scope of this lesson. Another contributor to sea-level rise is the increase in volume that occurs when water is heated, called thermal expansion. Both thermal expansion and ice melt are the results of the rise in global average temperatures on land and sea known as climate change.