Does anyone live in pratville. Alabama?

What group has historically made up the largest portion of immigrants in mexico?

Explain why components that are naturally found in air can be considered air pollutants.

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