A(n) is defined as the interrelationship between living beings and environment.1. ecosystem 2. life support system3. climate system4. atmospheric system

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 african continent is home of the worlds largest desert and longest river . t or f

An earthquake’s epicenter can be determined from arrival time data recorded on a(