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- 6
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- Abies concolor
- Abies magnifica
- Alameda County, California
- Alpine County, California
- Amador County, California
- American black bear
- Andesite
- Antelope Valley
- Atsugewi
- Avalanche
- Backcountry skiing
- Backpacking
- Bakersfield, California
- Bald eagle
- Bałdy
- Baranof Island
- Basalt
- Basaltic andesite
- Basin and Range Province
- BAT
- Battle Ax
- Big Sur
- Black Butte
- Blanca Peak
- Boating
- Borah Peak
- Broken Top
- Brook trout
- Brown Mountain
- Brown trout
- Buckwheat
- Bufflehead
- Burroughs Mountain
- Butte County, California
- Calaveras County, California
- Calc-alkaline magma series
- California
- California Coast Ranges
- California Department of Parks and Recreation
- California Dream
- California Gold Rush
- California Sound
- California State Capitol
- California State Legislature
- California State Route 89
- Calocedrus
- Calochortus
- Cambridge University Press
- Cascade Range
- Cascade Volcanoes
- Cascadia subduction zone
- Cathedral Rock
- CBS
- Central California
- Central Coast
- Central Valley
- Channel Islands
- Chaos Crags
- Chaparral
- Chipmunk
- Cinder cone
- Clark's nutcracker
- Climate of California
- Cloud Peak
- Coachella Valley
- Colusa County, California
- Common garter snake
- Common snipe
- Condé Nast
- Conejo Valley
- Contiguous United States
- Contra Costa County, California
- Copper Peak
- Cougar
- Crater lake
- Crime in California
- Cross-country skiing
- Cuisine of California
- Culture of California
- Dacite
- Dark-eyed junco
- Death Valley
- Debris flow
- Deformation
- Del Norte County, California
- Demographics of California
- Denali
- Diamond Peak
- Districts in California
- DOI
- East Bay
- Eastern California
- Economy of California
- Education in California
- Effusive eruption
- El Dorado County, California
- Elections in California
- Elko, Nevada
- Elsevier
- Emerald Triangle
- Endangered Species Act of 1973
- Environment of California
- Eureka, California
- Explosive eruption
- Fact
- Fathead minnow
- FERN
- Flavor
- Fresno, California
- Fresno County, California
- Fumarole
- Geographic coordinate system
- Geographic Names Information System
- Geography of California
- Geologic time scale
- Geology of the Lassen volcanic area
- Gilia
- Glacier
- Glacier Peak
- Glenn County, California
- Global Positioning System
- Global Volcanism Program
- Gold Country
- Golden shiner
- Government of California
- Governor of California
- Great Basin
- Greater Los Angeles Area
- Grizzly Peak
- Hairpin turn
- Haleakalā
- HDL
- Hearst Communications
- Hiking
- History of California
- Holocene
- Holodiscus discolor
- Hot spring
- Humboldt County, California
- Humphreys Peak
- Hydrothermal vent
- Idaho
- Imperial County, California
- Inclinometer
- Inland Empire
- International Standard Book Number
- Invasive species
- Invertebrate
- Inyo County, California
- Iron Mountain
- Jedediah Smith
- Jeffrey pine
- Journal of Volcanology and Geothermal Research
- Juniper
- Kern County, California
- Klamath Basin
- Klamath Mountains
- Lahar
- Lake County, California
- Lake Helen
- Lake Tahoe
- Landslide
- Larch Mountain
- Lassen County, California
- Lassen National Forest
- Lassen Volcanic National Park
- Lava dome
- Lava flow
- Law of California
- Lists of mountains
- Live oak
- Long Beach, California
- Los Angeles
- Los Angeles Basin
- Los Angeles County, California
- Lost Coast
- Lupinus
- Madera County, California
- Maidu
- Maria Ss
- Marin County, California
- Mariposa County, California
- Marten
- Mauna Kea
- Mauna Loa
- Medicine Lake Volcano
- Merced County, California
- Metropolitan statistical area
- Modoc County, California
- Mojave Desert
- Monardella villosa
- Mono County, California
- Monogenetic volcanic field
- Monterey County, California
- Mount Adams
- Mountain chickadee
- Mountain pocket gopher
- Mountain range
- Mount Bachelor
- Mount Baker
- Mount Cook
- Mount Daniel
- Mount Elbert
- Mount Graham
- Mount Hayes
- Mount Hood
- Mount Jefferson
- Mount Lemmon
- Mount McLoughlin
- Mount Mitchell
- Mount Nebo
- Mount Olympus
- Mount Rainier
- Mount Russell
- Mount Saint Elias
- Mount San Antonio
- Mount Scott
- Mount Shasta
- Mount Si
- Mount St. Helens
- Mount Tabor
- Mount Tehama
- Mount Timpanogos
- Mount Washington
- Mount Whitney
- Mount Wrangell
- Mudpot
- Mudslide
- Mule deer
- Napa County, California
- National Geographic
- National Geographic Society
- National Oceanic and Atmospheric Administration
- National Park Service
- Native Americans in the United States
- Nevada
- Newberry Volcano
- Newt
- Normal route
- North American Plate
- North American Vertical Datum of 1988
- North Bay
- North Coast
- North County
- Northern California
- Northern goshawk
- Oakland, California
- OCLC
- Orange Coast
- Orange County, California
- Owens Valley
- Pacific Northwest
- Pacific tree frog
- Peninsular Ranges
- Peregrine falcon
- Peromyscus
- Phantom Ship
- Phreatic eruption
- Pika
- Pikes Peak
- Pilot Peak
- Pinus albicaulis
- Pinus contorta
- Pinus ponderosa
- Pit River
- Placer County, California
- Pleistocene
- Pliocene
- Plumas County, California
- Politics of California
- Pomona Valley
- Positive change
- Precipitation
- Pumice
- Pyroclastic flow
- Rainbow Mountain
- Rainbow trout
- Redding, California
- Reptile
- Retaining wall
- Rhyolite
- Riverside County, California
- Rough-skinned newt
- Sacramento, California
- Sacramento County, California
- Sacramento metropolitan area
- Sacramento–San Joaquin River Delta
- Sacramento Valley
- Saddleback Valley
- Sagebrush lizard
- Salamander
- San Andreas Fault
- San Benito County, California
- San Bernardino County, California
- San Bernardino Valley
- San Diego
- San Diego County, California
- San Diego–Tijuana
- San Fernando Valley
- San Francisco
- San Francisco Bay Area
- San Francisco Chronicle
- San Francisco Peninsula
- San Gabriel Valley
- San Jacinto Peak
- San Joaquin County, California
- San Joaquin Valley
- San Jose, California
- San Luis Obispo County, California
- San Mateo County, California
- Santa Barbara County, California
- Santa Clara County, California
- Santa Clara Valley
- Santa Clarita Valley
- Santa Cruz County, California
- Santa Ynez Valley
- Sawtooth Mountain
- Scoria
- Scree
- Seismometer
- Shasta Cascade
- Shasta County, California
- Shield volcano
- Sierra Blanca
- Sierra Nevada
- Silicic
- Silicon dioxide
- Silicon Valley
- Siskiyou County, California
- Smithsonian Institution
- Snowmobile
- Snow Peak
- Snowshoe
- Solano County, California
- Song sparrow
- Sonoma County, California
- South Bay
- South Coast
- Southern Border Region
- Southern California
- Spotted owl
- Stanislaus County, California
- Star Peak
- Striped whipsnake
- Subduction
- Subsidence
- Summit
- Supreme Court of California
- Sutter County, California
- Table Mountain
- Tarn
- Tehama County, California
- Tephra
- Theodore Roosevelt
- Tholeiitic magma series
- Three Sisters
- Topographic map
- Topographic prominence
- Transportation in California
- Transverse Ranges
- Trinity County, California
- Tri-Valley
- Tsuga mertensiana
- Tui chub
- Tulare County, California
- Tumalo Mountain
- Tuolumne County, California
- Types of volcanic eruptions
- United States congressional delegations from California
- United States Department of Commerce
- United States Department of the Interior
- United States Forest Service
- United States Geological Survey
- U.S. National Geodetic Survey
- U.S. state
- Ventura, California
- Ventura County, California
- Vertebrate
- Victor Valley
- Viscosity
- Visiting
- Volcanic arc
- Volcanic ash
- Volcanic cone
- Volcano
- Washington
- Water in California
- Western United States
- Western white pine
- Wheeler Peak
- White Mountain Peak
- Wildflower
- Wilson's warbler
- Wine Country
- Wired
- Wizard Island
- Yana people
- Yolo County, California