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Fossilized remains, imprints, and traces of plants and animals preserved in rocks and sediments since some past geologic time.
- Browse Related Terms: Base camp, Eutectic, Feature, Fire-cracked rock, Flake, Fossil, lithic, Paleontological resources, Roost, Stratigraphy (stratigraphic)
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An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, spanning the time between 542 and 251 million years ago. The word Paleozoic is from Greek and means "old life."
- Browse Related Terms: Cenozoic, Holocene, Mean sea level (MSL), Mesozoic, Miocene, Paleozoic, Pleistocene, Pluvial lake, Quaternary, Tertiary period
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(1) A desert habitat with permanent water or a water table near the surface that supports a canopy of palm trees. Oasis habitats generally occupy sites with moist alkaline soils near seeps, springs, and streams. (2) An isolated palm-dominated area of vegetation in a desert, typically surrounding a spring or a similar water source. Palm oasis habitats are found adjacent to a number of other desert habitats including desert riparian, desert cactus shrub, and desert wash. In many cases, characteristic plant species from these habitats comprise the understory of palm oases.
- Browse Related Terms: Alpine, Alpine tundra, Aquatic habitats, Arctic tundra, Bunchgrass, Cienega, Desert riparian habitat, Lentic environment, Palm oasis, Slash, Sub-canopies, Subalpine, Tundra, Understory
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- Shallow freshwater wetlands that often support plant communities of trees, shrubs, emergent plants, mosses, or lichens. Palustrine wetlands without such plant communities are small (less than 20 acres [0.08 km2]) and lack an active wave-formed or bedrock shoreline.
- Browse Related Terms: Conifer, Deciduous, Emergent, Emergent wetlands, Flora, Forbs, Graminoid herbaceous, Herbaceous, Macrophyte (aquatic), Marsh, Mosses, Noxious weeds, Nurse plants, Palustrine wetlands, Pesticide, Phytoplankton, Sedge, Shrub, Weed
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- A measurement that combines or integrates the effects of several climate elements: temperature, humidity, solar radiation, and wind. Evaporation is greatest on hot, windy, dry days; and is greatly reduced when air is cool, calm, and humid. See also Evaporation rate
- Browse Related Terms: Center pivot irrigation, Closed-loop cooling system, Dry closed-loop cooling, Dry cooling, Dry cooling system, entrainment, Fujita Scale, Geographic Information System (GIS), GIS, Hybrid (wet-dry cooling) systems, Livestock guzzler, Pan evaporation, Reuse, Silencer, Wet closed-cycle cooling system, Wet cooling system
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- See Parabolic trough
- Browse Related Terms: Compact Linear Fresnel Reflector (CLFR), Concentrating solar collector, Concentrating solar power (CSP) technologies, Dish engine, Heat exchanger, Heat transfer fluid (HTF), Parabolic solar collector trough, Parabolic Trough, Parabolic trough system, Power tower, Rankine steam cycle, Steam turbine-generator (STG), Stirling Engine, Thermal energy
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A type of CSP solar energy technology that uses parabolic-shaped mirrors to concentrate sunlight on a receiver filled with a heat transfer fluid that subsequently transfers the heat it absorbs to water to produce steam to drive a steam turbine-generator (STG) to produce electricity. Parabolic trough systems typically mount the mirrors on a support that can track the sun's movement across the sky over the course of the day, ensuring maximum solar energy capture.
- Browse Related Terms: Compact Linear Fresnel Reflector (CLFR), Concentrating solar collector, Concentrating solar power (CSP) technologies, Dish engine, Heat exchanger, Heat transfer fluid (HTF), Parabolic solar collector trough, Parabolic Trough, Parabolic trough system, Power tower, Rankine steam cycle, Steam turbine-generator (STG), Stirling Engine, Thermal energy
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All > Science > Energy > Renewable Energy > Solar Energy
- See Parabolic trough
- Browse Related Terms: Compact Linear Fresnel Reflector (CLFR), Concentrating solar collector, Concentrating solar power (CSP) technologies, Dish engine, Heat exchanger, Heat transfer fluid (HTF), Parabolic solar collector trough, Parabolic Trough, Parabolic trough system, Power tower, Rankine steam cycle, Steam turbine-generator (STG), Stirling Engine, Thermal energy
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- Fine solid or liquid particles such as dust, smoke, mist, fumes, or smog, found in air or emissions. The size of the particulates is measured in micrometers (?m). One micrometer is 1 millionth of a meter or 0.000039 inch. Particle size is important because the EPA has set standards for PM2.5 and PM10 particulates.
- Browse Related Terms: Carbon Monoxide (CO), Particulate matter, PM10, PM2.5, SO2, Sulfur dioxide (SO2), Sulfur oxides (SOx)
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Birds of the order Passeriformes, which includes perching birds and songbirds such as the jays, blackbirds, finches, warblers, and sparrows.
- Browse Related Terms: Corridor-transmission, Corridor-wildlife, Ecological segmentation, Flyway, Migration corridor, Neotropical migrants, Passerine, Prey base, RAPTOR
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- Object or drawing having a human shape with a pattern or design. See also Anthropomorphic; Anthropomorphism
- Browse Related Terms: Archaeological site, artifact, Eligible properties, Historic properties, Multiple use, National Historic Trails, National Landscape Conservation System (NLCS), National Recreation Area, Patterned-body anthropomorphs, Peanut-body anthropomorphs, Seismicity, Special areas, State Historic Preservation Officer (SHPO), Wilderness characteristics
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All > Science > Energy > Renewable Energy > Solar Energy
- Object or drawing having a human-like shape resembling that of a peanut. See also Anthropomorphic; Anthropomorphism
- Browse Related Terms: Archaeological site, artifact, Eligible properties, Historic properties, Multiple use, National Historic Trails, National Landscape Conservation System (NLCS), National Recreation Area, Patterned-body anthropomorphs, Peanut-body anthropomorphs, Seismicity, Special areas, State Historic Preservation Officer (SHPO), Wilderness characteristics
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A broad, gently-sloping erosion surface developed at the base of a mountain range in a dry region. It is usually covered with a thin layer of gravel.
- Browse Related Terms: Alluvial valley, Bench, Intermontane basin, Mesa, Pediment, Plains, Upwarp, Valley floor
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The average income per person in a given group.
- Browse Related Terms: AADT, Access roads, Average Annual Daily Traffic (AADT), Climate, Glare, Low-income population, mean, Median household income, Median housing value, Milligauss (mG), Per capita income, Slip rate, Taxonomy
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A BLM grazing allotment that consistently produces enough perennial forage to support a year round livestock operation.
- Browse Related Terms: Allotment, Appropriations, Ephemeral allotment, Federal land, Grazing allotment, Oil and gas leasing (on BLM land), Perennial allotment, Permitted use
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Streams that flow continuously because they lie at or below the groundwater table, which constantly replenishes them.
- Browse Related Terms: Cone of depression, Ephemeral stream, Fall Line, Flood irrigation, Perennial streams, Phreatophytes, Piezometer, Spring, Sprinkler system
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Surface water features that contain water at all times throughout the year.
- Browse Related Terms: Albedo (effects), Alkali sink, Arable lands, Blowout, Desiccation, form, herbicide, Land cover, Land Use, Microsite, Perennial surface water features, Phreatic vegetation, Physiography, Scrubland, Swale, Terrain, Unconsolidated shore wetlands, Wickiup
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The amount of groundwater that can be withdrawn from a groundwater basin over a period of time without exceeding the long-term recharge of the basin or unreasonably affecting the basin's physical and chemical integrity.
- Browse Related Terms: Basin-fill aquifer, Bolson (floor), Closed Basin, compact, Depletion, Earthern cattle tank, Groundwater basin, Gypsum, Infiltration pond, Interbasin flow, Interbasin transfer of water, Interbasin transfers, Overdraft, Perennial yield (groundwater), reservoir, Safe yield, Sustainable yield
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A specified rate of groundwater pumping that can be sustained for an indefinite period of time without impairing hydrogeologic and ecologic processes, characteristics, or functions existing within a groundwater basin. Examples of impacts to hydrogeologic and ecologic processes, characteristics, and functions include (but are not limited to) alterations to basin-scale flow paths (direction and magnitude); significant drawdown of groundwater surface elevations; decreases in hydrostatic pressures; and decreased connectivity with surface features such as springs, wetlands, and phreatic vegetation. Quantifying perennial/safe/sustainable yields is a non-trivial task that is often done by examining basin-scale information on groundwater recharge, discharge, and storage processes that is obtained through the combination of extensive field-data collection and numerical modeling.
- Browse Related Terms: Augmentation water, Benthic, Channel incision, drawdown, Floodplain, Groundwater overdraft, hydrology, Inflow, Junior water rights, Kiva, Outflow, Perennial/safe/sustainable yield, Phosphorous, Point of diversion, Pueblo rights, Thermal water, Water right