The road is closed due to steep curves and steep slopes. Hong Kong's terrain is hilly and mountainous with steep slopes. The topsoil on the steep slopes is very thin. Meadows and pastures are also seen clinging to steep slopes. The volcano frequently erupted lava, which descended over steep slopes. The trail was a challenging of dangerous plains, hot deserts, and steep and rocky mountains. Terraced fields are common in islands with steep slopes. They grow on rocky soils deficient in nutrients, cliffs and steep mountains. Debris flows move as granular flows down steep mountain valleys and washes. Some farmers were killed by rollovers while operating tractors along steep slopes. Farming techniques are basic, with small plots of land and steep slopes. This is caused by a combination of saturated material, and steep slopes. Some territories are underwater, particularly those near steep cliffs. The mountains are notable for being steep and difficult to traverse. Kafiristan was full of steep and wooded valleys.