The chemicals can also pollute _____ water sources, making them unsafe.
solid
chemical
vapor
frozen
drinking
drinking
Topsoil may become so _____ that it cannot be used.
infertile
black
fertile
muddy
rocky
infertile
To determine which of the given options can be polluted and make water sources unsafe, we can analyze each option.
1. Solid: Solids generally do not pollute water sources. They may sink to the bottom, but they do not usually dissolve or contaminate the water.
2. Chemical: The phrase "chemical water sources" is ambiguous and does not specify the type of contamination. Chemicals, in general, can pollute water sources if they are toxic, harmful, or do not naturally occur in the water.
3. Vapor: Vapor refers to the gaseous form of a substance. Water vapor in the atmosphere can condense and become part of the water cycle. However, vapor itself does not generally contaminate water sources.
4. Frozen: Frozen water, such as ice, does not typically pollute water sources unless it contains impurities before freezing.
5. Drinking: The term "drinking water sources" indicates that the water is intended for human consumption. If the chemicals mentioned in the question contaminate drinking water sources, it can make the water unsafe to drink.
Therefore, based on the options provided, the correct answer is "drinking."