humic shale
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Oil shale — For the scientific technical journal, see Oil Shale (journal). Not to be confused with Shale oil or Tight oil. Oil shale Sedimentary Rock Combustion of oil shale Composition … Wikipedia
Oil shale geology — Main article: Oil shale Outcrop of Ordovician kukersite oil shale, northern Estonia. Oil shale geology is a branch of geologic sciences which studies the formation and composition of … Wikipedia
humate — noun material that is high in humic acids • Hypernyms: ↑material, ↑stuff • Hyponyms: ↑peat, ↑lignite, ↑brown coal, ↑wood coal, ↑humic shale … Useful english dictionary
cave — cavelike, adj. /kayv/, n., v., caved, caving. n. 1. a hollow in the earth, esp. one opening more or less horizontally into a hill, mountain, etc. 2. a storage cellar, esp. for wine. 3. Eng. Hist. a secession, or a group of seceders, from a… … Universalium
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
Vitrinite — is one of the primary components of coals and most sedimentary kerogens. Vitrinite is a type of maceral, where macerals are organic components of coal analogous to the minerals of rocks. Vitrinite has a shiny appearance resembling glass… … Wikipedia
Abiogenic petroleum origin — is a largely abandoned hypothesis that was proposed as an alternative to theory of biological petroleum origin. It was relatively popular in the past, but it went largely forgotten at the end of the 20th century after it failed to predict the… … Wikipedia
Soil acidification — is the buildup of hydrogen cations, also called protons, in the soil. This happens when a proton donor is added to the soil. The donor can be an acid, such as nitric acid and sulfuric acid (these acids are common components of acid rain). It can… … Wikipedia
Andes Mountains — Mountain system, western South America. One of the great natural features of the globe, the Andes extend north south about 5,500 mi (8,850 km). They run parallel to the Caribbean Sea coast in Venezuela before turning southwest and entering… … Universalium
dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or … Universalium
