(1)
Permafrost represents
Answer: permanently frozen subsurface soil
Answer: permanently frozen subsurface soil
Answer: Sandstone
Answer: Geothermal
Answer: ~ 6.6 %
Answer: Nuclear < Natural gas < Oil < Bituminous coal
Answer: Liquid Helium
Answer: 20
Answer: 100 km2
Answer: Black carbon aerosols
Answer: 0.2 Pa
Answer: HCN, COCl2
Answer: Aeration → Flocculation → Sedimentation → Recarbonation → Filtration → Disinfection
Answer: Pb210
Answer: Acrolein
Answer: Lichen