What types of nuclides are radioactive?
Earth is a dynamic planet whose surface is actively shaped by physical agents of change: - External (exogenic); ex: precipitation. Includes external processes that set, air, water (streams and waves), and ice into motion, powered by solar energy. This is the fluid realm of earth’s environment. o These sculpting agents that carve, shape, and reduce the landscape. - Internal (endogenic): encompasses internal processes that produce flows of heart and material from deep below the crust, powered by radioactive decay o This is the solid realm of earth. To what extent is Earth’s crust actively building at this time in its history - According to U.S. Geological Survey- exp