Thermal energy from the sun is transferred to the ear by? A. Radiation
B. Conduction
C. Convection

What are the 5 basic elements of a map?

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

Can someone me with this plz? ! i'm putting 20 points on it!