IN IRAN, A THIN COVERING OF OIL WAS POURED ON SANDY AREAS TO RETAI...

61. - TRAC NGHIEM TIENG ANH 12 UINT 9
TRAC NGHIEM TIENG ANH 12 UINT 9

61. In Iran, a thin covering of oil was poured on sandy areas to retain water for planting trees, and this

A B C D

method may harm the environment.