depth zones

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• Depth of focus (tectonics) — In seismology, the depth of focus refers to the depth at which an earthquake occurs. Earthquakes occurring at a depth of less than 60 km are classified as shallow focus earthquakes, while those with a focal depth between 60 and 300 km… …   Wikipedia

• Depth charge — For other uses, see Depth charge (disambiguation). Mark IX Depth Charge used by the U.S. Navy late in World War II. Unlike the cylindrical, barrel shaped depth charge used earlier, the Mark IX is streamlined and equipped with canted fins to… …   Wikipedia

• Defence-in-depth (Roman military) — Defence in depth is the term used by American political analyst Edward Luttwak (born 1942) to describe his theory of the defensive strategy employed by the Late Roman army in the 3rd and 4th centuries AD. Luttwak s Grand Strategy of the Roman… …   Wikipedia

• Defense in depth (computing) — Defense in depth is an information assurance (IA) concept in which multiple layers of security controls (defense) are placed throughout an information technology (IT) system. Its intent is to provide redundancy in the event a security control… …   Wikipedia

• Defense in Depth (computing) — Defense in Depth is an Information Assurance (IA) strategy in which multiple layers of defense are placed throughout an Information Technology (IT) system. It addresses security vulnerabilities in personnel, technology and operations for the… …   Wikipedia

• Organisms used in water purification — A flowering water purifying plant (Iris pseudacorus) At present, several species of water purifying plants, bacteria, and fish are used in water purification, improving efficiency and/or ecosystem support. Contents …   Wikipedia

• Well logging — Gamma ray logging Spontaneous potential logging Resistivity logging Density logging Sonic logging Caliper logging Mud logging LWD/MWD v · …   Wikipedia

• Treatment pond — A treatment pond treats water fouled by anaerobic bacteria. It is largely used by tree nurseries, dairy farms and other agricultural companies near horse or cattle sheds or barns. The pond treats unclean rainwater and animal effluent so that it… …   Wikipedia

• Lava filter — A lava filter is a biological filter that uses lavastone pebbles as support material on which microorganisms can grow in a thin biofilm. [ [http://www.stowa selectedtechnologies.nl/Sheets/Sheets/Lava.Filters.html Overview of lavafilters] ] This… …   Wikipedia

• Hawaiʻi Institute of Marine Biology — The Hawai i Institute of Marine Biology (HIMB) is a marine biology laboratory located on the state owned Coconut Island in Kāne ohe Bay. Coconut Island is approximately 29 acres, including convert|6|acre|m2 of enclosed lagoons used to keep… …   Wikipedia

• Constructed wetland — Vertical Flow type of Constructed Wetlands A constructed wetland or wetpark is an artificial wetland, marsh or swamp created as a new or restored habitat for native and migratory wildlife, for anthropogenic discharge such as wastewater,… …   Wikipedia