During the _ many people moved into _

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 pacific plate is an oceanic tectonic plate. how did a hot spot and the pacific plate interact to form the hawaiian islands?

Arow of elements on the periodic table is called an