It is estimated that 500 000 square kilometres of land in Africa is degraded, due to _____. a) soil erosion b) salinisation c) pollution d) desertification The correct combination of alternatives is: a, c and d a, b, c and d b, c and d
The correct answer is **a, b, c and d**.
All the options listed contribute to land degradation in Africa. Soil erosion (a), salinisation (b), pollution (c), and desertification (d) are significant factors leading to the degradation of land.