Final answer:
Ice melts at a higher temperature than similar substances because it forms strong hydrogen bonds that create a less dense lattice structure. This unique characteristic allows ice to float, providing insulation for aquatic ecosystems.
Step-by-step explanation:
Ice melts at a higher temperature than similar substances primarily because it forms hydrogen bonds. These bonds cause the water molecules in ice to be held in a lattice structure that is less dense than liquid water, requiring more energy (heat) to break apart and transition to a liquid state. The unique properties of water, such as its high heat capacity and high heat of vaporization, are also due to the hydrogen bonding between water molecules.
Furthermore, this lower density of ice compared to liquid water is essential for aquatic life, as it allows ice to float, creating an insulating surface layer that protects the ecosystem beneath. If ice were denser, it would sink, causing bodies of water to freeze from the bottom up, which could be detrimental to aquatic life.