5. what is the formula for calculating whether a star is circumpolar as viewed from a northerly latitude? is the star rigel circumpolar as viewed from tampa? clearly show your calculations.

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