Does a geologist study the boundaries between countries

Which of the following countries has declared itself nuclear free

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

Giving an address, such as "1000 elysian park avenue, los angeles, .ca, its an example of describing the