Which of the following rocks would you most likely find in a cave?

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

Compounds which are found naturally in the earth are called: a. ores b. composites c. rocks d. minerals

The “twelve apostles” are in which national park?