1.deforestation refers to the continual degradation of forests due to natural or human related causes.
2.the causes are requirement of wood
3.rapid urbaniztion is also its cause
4. another cause is overgrazing by cattle.
5.deforestation may have adverse effects .some are listed below
soil erosion and desertification,destruction of the natural habitat of animals and birds,increase in global temperature,reduced rainfall,floods and landslides.
hope it helps....