In the hypothesis testing approach of Jerzy Neyman and Egon Pearson, a null hypothesis is contrasted with an alternative hypothesis, and the two hypotheses are distinguished on the basis of data, with certain error rates. Proponents of each approach criticize the other approach.
In geography, relief refers to the highest and lowest elevation points in an area. Mountains and ridges are typically the highest elevation points, while valleys and other low-lying areas are the lowest. Relief is essential to understanding the topography of an area.
Erosion will wear away mountains after a long period of time. This will cause mountains to decrease in size and height. Cliffs, beaches and waterfalls can be formed in this waâ¦y through erosion by water. Also, hills can get more rounded after erosion. Soil erosion through deforestation can cause a large area of land previously covered with greenery to disappear and resulting in water pollution as well. Glaciers also contribute by eroding away walls of canyons.