Todas as depressões brasileiras são acima do nível do mar?

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

How many years is a term in the senate

Look at the map above. which of the following statement is true