Sand And Rock Mining In Merapi Volcano Slope

sand mining dredging Mount Merapi volcano Srumbung sub-district Magelang Central Java disaster-prone area environmental damage Mount Merapi national park cold lava flow hot clouds eruption vegetation loss natural barrier economic pressures worker safety environmental concerns village threats disaster risk lava flow volcanic activity national park area natural disaster safety hazard economic necessity habitat destruction volcanic eruption slope mining safety endangerment natural environment erosion.