The hydrologic carbon phosphorus cycles are essential to the this is why they are called biogeochemical cycles a. lithosphere b. hydrosphere c. asthenosphere d. biosphere

How do hearths affect cultural diffusion? a. a hearth is the destination of cultural diffusion. b. a hearth divides a cultural region in two. c. a hearth is the beginning point of cultural diffusion. d. a hearth is the means of cultural diffusion. e. a hearth is the meeting point of two diffuse cultures.