Question

1. why are water temperatures below 0°c possible in the ocean?

latent heat.
hydrogen bonds.
ice floats.
pressure.
the ocean is salty.

Explanation:

Salty water has a lower freezing point than pure water. The ocean contains salt (and other dissolved substances). When salt is dissolved in water, it disrupts the formation of ice crystals. This means that the ocean water can remain in a liquid state at temperatures below \(0^{\circ}C\) (the freezing point of pure water). Latent heat is related to phase - change energy (not directly to lowering the freezing point). Hydrogen bonds are important for water's properties like high specific heat but not for lowering the freezing point in this context. Ice floating is a result of water's density properties (ice is less dense than liquid water) and not the reason for water being liquid below \(0^{\circ}C\). Pressure can affect the freezing point, but the main and most common reason for ocean water being liquid below \(0^{\circ}C\) is its salinity.

Answer:

The ocean is salty.