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This term refers to the political authority held by individual citizens of the United States which, when transferred to the government, empowers the government to act on behalf of the citizens.

________ is the depth described at which the soil is completely saturated with water.

_________ is the process of changes in composition and structure of the rock due to wind, water, temperature, and chemical reactions.

How many modes of indirect disease transmission are there?

What are the two broad groups of diseases?

This rock type comprises the crust of the planet and comes from cooled and hardened molten lava.

Most current health problems involving pollution in the United States are from toxic chemicals rather than microbes. These are referred to as ______ diseases.

________ is the percentage of total rock volume that is occupied by voids or pore spaces.

Which mode of indirect disease transmission is the least common?

What is the term given to a combination of silt and sand that contains some organic material and is suitable for the growth of plants?