Question

which of these is a property of water that allows it to transport materials through earths systems?
it expands as it solidifies.
it is transparent.
it dissolves many substances.
it is a compound.

Explanation:

Water is known as the "universal solvent" because it can dissolve many substances. This property allows it to carry nutrients, minerals, and other materials through Earth's systems (like in rivers transporting sediments, in the bloodstream carrying nutrients in organisms, etc.). Being a compound ($H_2O$) is a general chemical classification and not directly related to its transport - enabling property. Transparency is a physical property but not the key property for transport. Water contracts when it freezes (unlike what the option says, it actually expands when it freezes, but this expansion is not related to transporting materials through Earth's systems).

Answer:

It dissolves many substances.