Drag each tile to the correct box.
Match each modification to its effect on an ecosystem.

a) Many desert regions in the West were transformed
into lush urban areas and farmlands.

b) Water bodies in the Owens Valley and its
surrounding areas began to dry up.

c) Runoff containing disease-carrying organisms
contaminated soil and caused water pollution.

1. construction of the Los Angeles aqueduct

2. construction of large highways

3. damming of the Colorado River