Which of the stated surfaces will reduce the wind speed most due to ground friction?

Question

PPL(A) - Private Pilot License - Meteorology - Which of the stated surfaces will reduce the wind speed most due to ground friction?

QuizVDS · Accepted Answer

Mountainous areas, vegetation cover

QuizVDS · Answer

Flat land, deserted land, no vegetation

QuizVDS · Answer

Oceanic areas

QuizVDS · Answer

Flat land, lots of vegetation cover

PPL(A) EN: Which of the stated surfaces will reduce the wind speed most due to ground friction?