Which of the following is renewalbe resources

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

Which country is the smallest island of the greater antilles

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.