What type of plate boundary is found off the coast of northernmost California, Oregon and Washington State?

The length of the path between two points is what

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

How does central place theory explain patterns in the size and distribution of cities?