Siberia has experienced many enviromental problems because of

Policies during the Soviet era

The changes that Russia underwent during the Soviet Era were extremely profound. In Siberia, these have severely affected the environment. These policies were often designed as a way to industrialize the country, with little regard for the environment. It is likely that current climate change will continue to damage the environment of this region.

answer; /// i believe that the correct answer is (d)the huang he river valley;

they are best known for the cliff pueblos found throughout arizona, new mexico, colorado and utah. and for their development of desert farming.

hope i

-lavira: )