what are the spheres of water flow, flooding, freezing, wind, volcanoes and plate tectonics and plant and animal life ?

Which of the following best describes the economy of africa?

Which type of mass movement is the most destructive? creep erosion landslide slump

Can you think of any problems that could come from using only 15 years of data to predict trends for the next 100 years? explain your answer. how could you prevent some of these problems?