Streams erode sediment from their banks. They pick up and transport sediments. As a stream erodes its banks, it creates a V-shaped valley (Figure above). This contrasts with the U-shaped valleys created by glaciers.
Answer: "cluster" .
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It's becasue human populations are concentrated in areas that are lacking proper resources.
Mexico is a country where the social life and culture are a mixture of European and Mesoamerican traits.
Explanation:
Mexico is a country that has been part of the Spanish colonization. This has resulted in big impact by the Spanish, especially in the culture. While the Spanish imposed their own cultural traits, lot of the cultural traits of the local population shave also been kept.
The cultural landscape of Mexico nowadays is a mixture between the Spanish culture and the Mesoamerican cultures. The large cities tend to be leaning more toward the Spanish culture, while the rural areas tend to lean more toward the Mesoamerican cultures.
Unfortunately, lot of bad characteristics have been preserved from both of the different cultures that created the modern day Mexican culture. Such things have been the imposing of power over the poor and treating them as slaves, the development of local powerhouses based on criminal activities, thus the cartels, and the brutal and seeming casual murders, often of innocent people.
Some of the Mesoamerican cultures that have contributed to the Mexican culture are:
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