Prior to the mid 20th century, the Colorado River flowed continuously from the Rocky Mountains to the Gulf of California. Since this time, several major projects have taken water away from the river's natural course. One of these projects has been the Colorado River Aqueduct, which takes water from the Colorado river and transports it to the Los Angeles area for drinking water. Today, during many times of year, the Colorado River no longer reaches the Gulf of California.

The dam pictured below takes water from the Colorado River so it can be transported along the aqueduct. On the right, a dried-up portion of the river in Baja California is shown.



This example illustrates that
A.
water flows in unpredictable ways and cannot be used for human purposes.
B.
human activities can vastly change how water flows along the Earth's surface.
C.
a changing climate can bring floods to some areas and droughts to others.
D.
humans are helpless to change the way that water flows along the Earth's surface.
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