Dust bowl resulted from extreme drying and loosening of the soil that resulted in soil erosion by wind. Thus, it can be related that poor agricultural practices like over plowing , over grazing and leaving the land barren are human activities that must have contributed to the dust bowl.
Explanation:
Dust bowl is referred to a period in early twentieth century when the the American and Canadian prairies faced severe dust storms.
These dust storms resulted from severe drought and failure of practices to prevent soil erosion.
Several people and livestock died as a result of choking.
Over plowing, removal of top soil and small grasses exposed the soil to eroding winds and caused the dust storms.
Circulatory system.....circulates blood (a vital delivery system of oxygen) throughout the whole body when tissues need it the most and with a constant supply.
