DESERTIFICATION -DESERT LIKE CONDITIONS DUE TO VARIOUS FACTORS.
DESERTIFICATION -IT IS THE SPREAD OF DESERT LIKE CONDITIONS IN ARID OR SEMI ARID AREAS DUE TO MAN'S INFLUENCE OR CLIMATIC CHANGE.
DEFORESTATION - THE PERMANENT REMOVAL OF TREES
DEFORESTATION , CAUSES OF DEFORESTATION;EFFECTS OF DEFORESTAION, IMPACT OF DAM BUILDING.