Question

short or long response as instructed: 1. explain why the color of ocean water is generally blue. provide the factors that may make ocean water of varying color in aquatic environments. (10 points) 2. why does ice float on water? discuss the importance of this property to marine organisms, particularly during winter. (10 points)

Explanation:

1. Ocean water appears blue primarily because water molecules scatter shorter wavelengths of visible light (blue) more effectively via Rayleigh scattering. Varying colors result from factors like suspended particles, algae (e.g., phytoplankton causing green/brown hues), dissolved organic matter, and water depth.
2. Ice floats on water because its density (0.917 g/cm³) is lower than liquid water (1 g/cm³) due to hydrogen bonding forming a hexagonal lattice that expands when frozen. This property insulates the water below, preventing complete freezing and allowing marine organisms to survive in liquid water during winter.

Answer:

1. Ocean water is generally blue due to Rayleigh scattering of short-wavelength blue light by water molecules. Varying colors are caused by suspended particles, algae, dissolved substances, and depth.
2. Ice floats because its density is lower than liquid water (expansion from hydrogen bonding). It insulates water below, preventing total freezing and supporting marine life in winter.