What is the total surface area of three of these ice cubes

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

The primary agent of contact metamorphism is

When you cross a time zone going east, what happens to the time