1.10 part2 multiple choice regrants

The earth's internal process which drives seafloor spreading is

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

Select the word from the list that best fits the definition of branch of islam that is in iran