Submitted by admin on Sat, 04/12/2014 - 22:12
definition:
The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture
sentence:
The problems are global - poverty, air and water pollution, deforestation, desertification, overfishing, climate change - no country can confront these challenges alone.
difficulty:
medium
toefl frequency:
2
toefl classification: