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Valleys can be located in continents that are usually lands between hills or mountains.
in the valleys
Valleys
Mountains and hills
no
Mountains, valleys and plains.
all over
river valleys
because they cause pollution by taking the dirt and rocks to neighboring valleys
In fertile river valleys.
The Fertile Willamette Valley is located in Oregon, while the Central Valley is located in California. Both valleys are known for their fertile soil and agricultural productivity.
Valleys are prone to flooding, erosion, and landslides due to their topography. They can also trap pollutants and restrict air circulation, leading to poor air quality. Additionally, valleys may be more susceptible to temperature inversions, resulting in stagnant air and increased pollution levels.