When someone decides to change a source with invalid, incorrect, irrelevant, or just idiotic information.
Answer:
Welcome
Explanation:
<em>They followed favorable weather patterns, natural agricultural cycles, and animal migrations.</em> The vastness of the northern part of the continent encouraged other indigenous communities to live nomadic lifestyles. These cultures did not establish urban areas or agricultural centers.
<span>Many factors can affect how long it takes for an inch of topsoil to form, but it normally takes at least 100 years and often over 500 years. The factors that affect soil formation are parent material, topography, climate, organisms and time.</span>