Final answer:
The Ogallala Aquifer is the largest in the Midwest, running through Kansas and several other states. It is essential for irrigation and agriculture and has been a focal point for environmental concerns, especially regarding the Keystone XL pipeline project.
Step-by-step explanation:
The aquifer that runs along Kansas and other Midwestern states is known as the Ogallala Aquifer. It is the continent's largest aquifer and a vital water source for irrigation and other uses. This aquifer extends under parts of Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. The Ogallala Aquifer is particularly important for agricultural activities, such as the cultivation of spring wheat in North Dakota and winter wheat in Kansas. Environmental concerns, such as those associated with the proposed Keystone XL pipeline, have highlighted the importance of this aquifer with potential risks of contamination and habitat disruption.