What would happen to terrestrial life if the density of ice was greater than the density of water?

Answer 1

Well, the density of ice is clearly lower than water, thus, it floats. If the density were to be higher however, the ice caps which are floating in northern and southern Earth would sink. this will cause many problems in the terrestrial life. water levels will rise dramatically which means the temperature will decrease in large amounts. this means that creatures we are used to knowing will either die out or migrate to satisfy its needs. other travesties would include the diminishing of cooler areas in Antarctica and Northern countries. extinction will be the primary fault.

Answer 2

If ice were more dense than water all freezing water (ice) would sink to the bottom of lakes and rivers and seas. The "normal" condition of ice providing an insulating layer on the surface over the water would be lost and the ice would continue to form until all fluid water was frozen. No aquatic animals would survive. In the same way that "normal" ice keeps water from freezing to the bottom. The "heavy" ice forming water would protect the sunken ice from thawing and the waters would stay frozen essentially from bottom to top - forever.