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Bernal Heights Summit
Bernal Heights Summit ( ) or Bernal Heights Hill is a hill in the San Francisco, California neighborhood of Bernal Heights. Upper elevations are part of Bernal Heights Park, which is managed by the San Francisco Recreation & Parks Department. At its highest elevation (466 ft.) is a privately-owned equipment building and 50-foot tall telecommunications tower. The tower does not have an official name, but some residents call it "Sutrito", as it resembles a shorter version of Sutro Tower. The park and summit are largely surrounded by Bernal Heights Boulevard. Ecology Unusual flora and fauna can be found on Bernal Hill. Wildflowers include the footsteps of spring, blue-eyed grass, checkerbloom, shooting star and yellow mariposa lily. Bernal Hill was one of the earliest hills in San Francisco to be re-colonized by wild coyotes. Geology Bernal Hill, along with the other hills in the San Francisco area, is a folded hill; it was created by the "wrinkling up" effect of the Pacific pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sidalcea
''Sidalcea'' is a genus (approx. 25 species) of the botanical family Malvaceae. It contains several species of flowering plants known generally as checkerblooms or checkermallows, or prairie mallows in the United Kingdom. They can be annuals or perennials, some rhizomatous. They are native to West and Central North America. In mid- to late summer the clumps of toothed basal leaves produce erect flowering stems, with 5-petalled mallow-type flowers in terminal racemes, in shades of pink, white and purple. ''Sidalcea'' is generally diploid (2n = 20), but polyploidy (4n, 6n) also occurs. Annuality appears to have evolved multiple times (4+) within this genus, although an ancestral annual state with annual paraphyly is also possible. Further, evolution rates within annual ''Sidalcea'' lineages appear to be faster than those of perennial lineages, at least when examining nuclear ribosomal DNA (internal and external transcribed spacer regions). Selected species: (A = annual, P = pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Hills In San Francisco
This is a list of the hills of San Francisco, California. Prior lists Several cities claim to have been built on seven hills. "The Seven Hills of San Francisco" are Telegraph Hill, Nob Hill, Russian Hill, Rincon Hill, Twin Peaks, Mount Davidson and Lone Mountain or Mount Sutro. The origin of most longer lists of San Francisco hills is ''Hills of San Francisco'', a compilation of 42 ''San Francisco Chronicle'' columns, each describing one of the city's hills. The "Hills" chapter of Gladys Hansen's ''San Francisco Almanac'' repeated the list given in ''Hills of San Francisco'' and added the then-recently-named Cathedral Hill for a total of 43, but the "Places" chapter listed many additional hills. More recent lists include more hills, some lesser-known, some not on the mainland, and some without names. Map Hills See also * List of San Francisco placename etymologies * List of summits of the San Francisco Bay Area * Neighborhoods in San Francisco References External lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron Oxide
Iron oxides are chemical compounds composed of iron and oxygen. Several iron oxides are recognized. All are black magnetic solids. Often they are non-stoichiometric. Oxyhydroxides are a related class of compounds, perhaps the best known of which is rust. Iron oxides and oxyhydroxides are widespread in nature and play an important role in many geological and biological processes. They are used as iron ores, pigments, catalysts, and in thermite, and occur in hemoglobin. Iron oxides are inexpensive and durable pigments in paints, coatings and colored concretes. Colors commonly available are in the "earthy" end of the yellow/orange/red/brown/black range. When used as a food coloring, it has E number E172. Stoichiometries Iron oxides feature as ferrous ( Fe(II)) or ferric ( Fe(III)) or both. They adopt octahedral or tetrahedral coordination geometry. Only a few oxides are significant at the earth's surface, particularly wüstite, magnetite, and hematite. * Oxides of FeII ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiolaria
The Radiolaria, also called Radiozoa, are protozoa of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule dividing the cell (biology), cell into the inner and outer portions of endoplasm and Ectoplasm (cell biology), ectoplasm. The elaborate mineral skeleton is usually made of Silicon dioxide, silica. They are found as zooplankton throughout the global ocean. As zooplankton, radiolarians are primarily heterotrophic, but many have photosynthetic endosymbionts and are, therefore, considered mixotrophs. The skeletal remains of some types of radiolarians make up a large part of the cover of the ocean floor as siliceous ooze. Due to their rapid change as species and intricate skeletons, radiolarians represent an important diagnostic fossil found from the Cambrian onwards. Description Radiolarians have many needle-like pseudopods supported by bundles of microtubules, which aid in the radiolarian's buoyancy. The cell nucleus and most oth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chert
Chert () is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a precipitation (chemistry), chemical precipitate or a diagenesis, diagenetic replacement, as in petrified wood. Chert is typically composed of the petrified remains of siliceous ooze, the biogenic sediment that covers large areas of the deep ocean floor, and which contains the silicon skeletal remains of diatoms, Dictyochales, silicoflagellates, and radiolarians. Precambrian cherts are notable for the presence of fossil cyanobacteria. In addition to Micropaleontology, microfossils, chert occasionally contains macrofossils. However, some chert is devoid of any fossils. Chert varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty redW.L. Roberts, T.J. Campbell, G.R. Rapp Jr. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiolarian
The Radiolaria, also called Radiozoa, are protozoa of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule dividing the cell into the inner and outer portions of endoplasm and ectoplasm. The elaborate mineral skeleton is usually made of silica. They are found as zooplankton throughout the global ocean. As zooplankton, radiolarians are primarily heterotrophic, but many have photosynthetic endosymbionts and are, therefore, considered mixotrophs. The skeletal remains of some types of radiolarians make up a large part of the cover of the ocean floor as siliceous ooze. Due to their rapid change as species and intricate skeletons, radiolarians represent an important diagnostic fossil found from the Cambrian onwards. Description Radiolarians have many needle-like pseudopods supported by bundles of microtubules, which aid in the radiolarian's buoyancy. The cell nucleus and most other organelles are in the endoplasm, while the ectoplasm is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calochortus Luteus
''Calochortus luteus'', the yellow mariposa lily, is a mariposa lily endemic to California. Description The primarily bright deep yellow flower is 3–5 cm across and perianth bulb-shaped, lined red-brown inside, often also with central red-brown blotch and sparse hair inside. It is a perennial herb. Distribution This species is found on coastal prairie, grasslands and some open forest floors. Its range is along the coastal ranges from region to the northern Santa Barbara County Channel Islands and mainland, Northwestern California, the Sacramento Valley, and the Sierra Nevada foothills from there to the Tehachapi Mountains. Cultivation ''Calochortus luteus'' is used in landscape design, with ''"non-habitat sourced"'' bulbs available from native plant nurseries and societies, to grow as an ornamental plant in gardens and for restoration Restoration is the act of restoring something to its original state and may refer to: * Conservation and restoration of cultural herit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dodecatheon
''Primula'' sect. ''Dodecatheon'' is a section of herbaceous flowering plants in the family Primulaceae. ''Primula'' species in this section were formerly placed in a separate genus, ''Dodecatheon''. The species have basal clumps of leaves and nodding flowers that are produced at the top of tall stems rising from where the leaves join the crown. The genus is largely confined to North America and part of northeastern Siberia. Common names include shooting star, American cowslip, mosquito bills, mad violets, and sailor caps. A few species are grown in gardens for their showy and unique flower display. The stamens are thrust out with the sepals bent back. The flowers are pollinated by bees, which grab hold of the petals, and gather pollen by vibrating the flowers by buzzing their wings (buzz pollination). The vibration releases pollen from the anthers. Taxonomy Carl Linnaeus created the genus ''Dodecatheon'' in ''Species Plantarum'' in 1753. ''Dodecatheon'' could be distinguished ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sisyrinchium
''Sisyrinchium'' is a large genus of annual to perennial flowering plant in the family Iridaceae. Native to the New World, the species are known as blue-eyed grasses and, though not true grasses and in varieties with flower colors other than blue, are monocots. Several species in the eastern United States are threatened or endangered. Description These are not true grasses, but many species have the general appearance of grasses, as they are low-growing plants with long, thin leaves. They often grow on grasslands. Many species resemble irises, to which they are more closely related. Most species grow as perennial plants, from a rhizome, though some are short-lived (e.g. ''Sisyrinchium striatum)'', and some are annuals (e.g. '' Sisyrinchium iridifolium''). The flowers are relatively simple and often grow in clusters. Many species, particularly the South American ones, are not blue, despite the common name. The genus includes species with blue, white, yellow, and purple pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Francisco
San Francisco (; Spanish language, Spanish for "Francis of Assisi, Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the List of California cities by population, fourth most populous in California and List of United States cities by population, 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of , at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the County statistics of the United States, fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include ''SF'', ''San Fran'', ''The '', ''Frisco'', and '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanicula Arctopoides
''Sanicula arctopoides'' is a species of sanicle known commonly as footsteps of spring, bear's foot sanicle or yellow mats. It is a perennial herb found on the west coast of the United States and Canada, especially near the ocean. The branches are short and thick and may be prostrate or slightly erect. The leaves are yellowish-green and carrot-like or maple-shaped, and the tiny yellow flowers are borne in umbels with prominent bract In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves. They may be smaller, larger, or of ...s. The plants grow in low matted patches along the ground, resembling "footsteps" of yellow against the background. This is a protected species in some areas. External linksUSDA Plants Profile for ''Sanicula arctopoides'' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
