How could environmental conditions in agriculture today change the spatial organization of agriculture from von thunen's model?

The cross section of rectangular prism a measures 1.5 units by 1 unit. the cross section of triangular prism b has a base that measures 2 units and a height of 1.5 units. if the length of each prism is 1.81 units, which statement is true?

Distance that the transcontinental railroad covered from omaha to san francisco.

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)