Isthmus.........................................
The author uses a historical text. It is a written document that allows obtain a more completed, diversified and meaningful knowledge of history. A historical text is a written document that can provide us, after its interpretation, knowledge about the human past. The object of commenting on a historical text is to approach the understanding of a historical epoch based on the elements provided by the text. Hence the importance of placing the document in its context. It is necessary to unravel what its author or authors have said, how they have said it, when, why and where, always relating it to its historical moment. They are based on reality, generally their structure is narrative and descriptive; usually they are written chronologically and reflect experiences.
A period of severe dust storms that greatly damaged the ecology and agriculture of the U.S. and Canadian prairies during the 1930s
Wind is the agent of erosion that creates sand dunes. The wind blows grains of sand into a sheltered or otherwise secure location, allowing gradual accumulation.
