Select the correct answer from each drop-down menu. Civil engineers conducted a land survey in a hilly region, where roads were carved out between steep hillside slopes. Complete the passage to reveal the engineers’ safety recommendations for the area.

The engineers noted that the area was prone to rockfalls and landslides. They proposed a plan to secure the rocky hillside slopes using (1.wire mesh and bolts, 2. gravel and water, 3. adhesive tape and plastic.)
. They also advised their team that if the slopes are not stabilized, (1. air pressure, 2. magnetismt, 3. gravity)
could cause damaging mass movement without warning.