Materials found in the earth that people need and value

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 is not an example of a  cultural  bond found in a nation-state? a. a holiday traditionb. a common religionc. a favorite placed. a shared history

On nights when we see the new moon phase, what side of the moon are we seeing?