Answer:
External and Internal forces.
Explanation:
The earth's relief forms such as Mountains, Rivers, Plateaus etc, are changed because of the action of internal and external forces for example; wind, water or human activities.
High levels of dissolved oxygen
Their clean energy sources are important to the region because Europe has a fast growing population, and need renewable energy sources that are reliable and efficient. <span />
The Bio Bio river is located to the west of Chile.
