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grandymaker
2 months ago
9

The Earth is a unique planet in that it is covered by more than 70 percent water. There are several properties of water that mak

e Earth a suitable environment for life, including how the density of solid water (ice) is about nine percent less than the density of liquid water. Which best explains why this feature of water is important for marine life?
Ice forms from the bottom of the water column up, allowing organisms to freeze and enter hibernation.

Ice forms from the top of the water column down, creating a protective barrier over the liquid water.

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

The higher-density liquid water traps nutrients for primary producers better than the less-dense ice.
Biology
2 answers:
Tresset [2.2K]2 months ago
6 0
The liquid water, being denser, offers better protection from cold air for organisms in comparison to the ice, which has lower density. This density variation prevents lakes and seas from freezing completely, as a less dense layer of ice forms at the surface, acting as a thermal insulator that keeps the water beneath it liquid. This is essential for the survival of aquatic plants and animals. Ice serves as an insulator due to its specific heat of 2.03 J/g. ºC, which is lower than that of water at 4.18 J/g. ºC. Once winter passes and warmer weather arrives, the surface ice melts easily, which would not occur if the ice sank to the bottom; such a scenario would threaten the survival of aquatic life. Additionally, liquid water achieves its maximum density at approximately 4ºC (1,000 g/cm3). During seasonal transitions like spring and fall, water reaches temperatures close to this point, becoming denser and sinking, which creates convection currents that help distribute nutrients throughout the water.
11111nata11111 [2.5K]2 months ago
6 0
The liquid water, which is denser, provides better insulation against cold air for organisms than the less-dense ice.
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