Which part of the following characteristic of both weathering and erosion

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

Because its government strictly controls its economy, north korea has a economy. a. command b. mixed c. traditional d. free market