Por que la antartida no esta dividida politicamente

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)

Which of the following is the main purpose of using an anchored network of booms which funnel debris to a collection area?