Human activity damages Mexico-US border - physicsworld.com
Human activity damages Mexico-US border physicsworld.comEach year an estimated half a million people slip illegally over the Mexico-US border. Trying to stop them are over 20,000 Border Patrol agents, guarding a more ...
Human activity damages Mexico-US border physicsworld.com
Each year an estimated half a million people slip illegally over the Mexico-US border. Trying to stop them are over 20,000 Border Patrol agents, guarding a more ...
