¿por qué es tan importante el conocimiento del clima de un lugar para la sociedad y sus actividades económicas?

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

Over half of the african-american population in the united states live in

Answer this asap. why did the americans go to china? a. trading b. exploration c. land d. live stock