Explain how ethnic enclaves were created in the United States as well as their role today.

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

Does water only take one path through the water cycle? (15 points)

What factors britain to become an industrial and commercial power?