Fearing contamination of the stream, you decide it would be wise to use some form of disinfection before drinking the water. The nearest town has only a grocery store, pharmacy, and post office. What might you purchase? Why?

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

According ti the following map, what are the most common mineral resources found in the united states?