Weathering is related to the breaking down and loosening of rock or soil into smaller pieces, but the weathered pieces remain in place. Erosion is related to the movement of weathered (and sometimes non-weathered) pieces away from the source.
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Migration, whether internal or international, has always been one of the forces driving the growth of urbanization and bringing opportunities and challenges to cities, migrants and governments. Increasingly, municipal authorities are becoming recognized as key actors in managing migration and have started including migration in their urban planning and implementation.
For cities to better manage migration, data on migration and urbanization are essential. However, these data are not always available or – if available – not used or accessible at the urban level, nor disaggregated, comprehensive or comparable, particularly in low-income countries.
Time distance decay
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