What is the capital of Alabama of usa

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

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

8. compare the education of a sparta boy and an athenian boy. (2 points)