5. which of the following resources is a nonrenewable resource?
a. riverb. goldc. treed. carbon

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

What happens to rock when acid reacts with it?

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.