What are two ways in which waves erode the land

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

Which arrow is closest to laguna madra bay? a. 1 b. 2 c. 3 d. 4

Witch are features of the social democracy that is common in europe