The increasing amount of usage of sexual protection.
1. Transportation
2. Weathering
3. Erosion
4. Ice
5. Erodes
6. Shorter and more rounded
7. Water cycle
8 nitrogen cycle
9. Carbon cycle
West Siberian Plain, Russian Zapadno-sibirskaya Ravnina, one of the world's largest regions of continuous flatland, central Russia. It occupies an area of nearly 1,200,000 square miles (3,000,000 square km) between the Ural Mountains in the west and the Yenisey River valley in the east.