Volcanoes 100 Groundwater 68 Kilauea Volcano (Hawaii) 54 Geology 53 Hawaii 48 Earthquakes 41 Water-supply 41 Hawaii History 35 Endangered plants 30 Plant conservation 29 Volcanism 29 Hydrogeology 26 Volcanic eruptions 26 Water quality 23 Hawaiians Legal status, laws, etc 22 Hydrology 21 Stream measurements 21 Streamflow 21 Kilauea Volcano (Hawaii) Eruptions 20 Hawaii Politics and government 19 Coral reefs and islands 18 Hawaii Description and travel 18 Rare plants 18 Lava flows 17 Hawaiians Government relations 16 Lava 16 Homestead law 15 National parks and reserves 15 Basalt 13 Mauna Loa (Hawaii Island, Hawaii) 13 Volcanic hazard analysis 13 Monitoring wells 12 Seismology 12 Volcanic activity prediction 12 Coral reef conservation 11 Groundwater flow 11 Volcanic ash, tuff, etc 11 Water quality management 11 Aquifers 10 Borings 10 Endangered species 10 Environmental impact analysis 10 Hawaii Relations 10 United States Relations 10 Wildlife conservation 10 Environmental monitoring 9 Groundwater Quality 9 Groundwater recharge 9 Hawaii Volcanoes National Park (Hawaii) 9 Kaloko-Honokohau National Historical Park (Hawaii) 9 Land tenure Law and legislation 9 Mainstreaming in education 9 Wildlife refuges 9 Benthos Habitat 8 Federal aid to housing 8 Hawaiians Housing 8 Ocean bottom 8 Petrology 8 Conservation of natural resources 7 Earth movements 7 Groundwater flow Mathematical models 7 Hawaii Antiquities 7 Historic sites Law and legislation 7 Home ownership Law and legislation 7 Oceanography 7 Saltwater encroachment 7 Tsunamis 7 Volcanic gases 7 Water levels 7 Water table 7 Birds Conservation 6 Children with disabilities Education 6 Coral reef ecology 6 Fisheries 6 Floods 6 Groundwater flow Computer simulation 6 Historic sites 6 History 6 Igneous rocks 6 Kealia Pond National Wildlife Refuge (Hawaii) 6 Landslides 6 Marine ecosystem management 6 Medical care Finance Law and legislation 6 National parks and reserves Law and legislation 6 Pearl Harbor (Hawaii), Attack on, 1941 6 Photovoltaic power generation 6 Public lands 6 War memorials Law and legislation 6 Wind power 6 Appropriations and expenditures 5 Coasts 5 Earthquake hazard analysis 5 Economic development 5 Evaluation 5 Geomagnetism 5 Groundwater Pollution 5 Hawaiian Islands Humpback Whale National Marine Sanctuary (Hawaii) 5 Hawaiians 5 Hawaiians Housing Law and legislation 5 Hawaiians Social life and customs 5