Rate This Topic

Average: 0/5

Geology

  • Earthquake Featured Article Earthquake Earthquake

    An earthquake is a sudden vibration or trembling in the Earth. More than 150,000 tremors strong enough to be felt by humans occur each year worldwide (see Chance of an... More »

  • Backshore Featured Article Backshore Backshore

    The backshore is that part or zone of a beach profile that extends landward from the sloping foreshore to a point of either vegetation development or a change of physiography,... More »

  • Acid sulfate soils Featured Article Acid sulfate soils Acid sulfate soils

    Main source: K.Ljung, F.Maley, A.Cook & P.Weinstein. Acid sulfate soils and human health. A Millennium Ecosystem Assessment. Environment International 35 (8), 1234-1242.... More »

  • Alley, Richard Featured Article Alley, Richard Alley, Richard

    Richard Alley (1957 - ) is the Evan Pugh Professor of the Department of Geosciences and EMS Environment Institute at Pennsylvania State University. His current research... More »

  • Antarctica: A Journey of Discovery Featured Article Antarctica: A Journey of Discovery Antarctica: A Journey of Discovery

    Useful to Teachers Across Disciplines The National Science Foundation's Office of Polar Programs has produced a full-color, extensively illustrated booklet that highlights... More »

  • Zinc Featured Article Zinc Zinc

    Previous Element: Copper Next Element: Gallium ... More »

  • Chromium Featured Article Chromium Chromium

    Previous Element: Vanadium Next Element: Manganese ... More »

  • Calcium Featured Article Calcium Calcium

    Calcium is the chemical element with atomic number 20; it has an atomic mass of 40.078 atomic mass units (amu). The chemical symbol for calcium is Ca. Calcium is a soft gray... More »

Recently Updated
Leather Oak Last Updated on 2014-01-18 12:16:02 The Leather Oak, a California endemic, occurs primarily in the California interior chaparral and woodlands ecoregion. It is a species with strong affinity for ultramafic soils, a geochemical class of high magnesium, low calcium and nutrient deficient media.  In appearance this is a shrub-like tree whose leathery leaves reveal its common name and obvious membership in the sclerophyll vegetation category, a morphological class of hard leaved species that may occur in such diverse places as Australia, Southern Africa, the Chilean matorral and the Mediterranean Basin as well as the California Floristic Province.  Q durata has two recognized varieties:    * var. durata, occurs at elevation 150 to 1500 m in the California North and South Coast Ranges, San Francisco Bay Area and northern Sierra Nevada foothills. Upper leaf sufaces of this variety are severely... More »
Calcium Last Updated on 2013-10-24 16:29:12 Calcium is the chemical element with atomic number 20; it has an atomic mass of 40.078 atomic mass units (amu). The chemical symbol for calcium is Ca. Calcium is a soft gray alkaline earth metal, and is the fifth most abundant element by mass in the Earth's crust; moreover, it is the fifth most abundant dissolved ion in seawater both in terms of number of atoms and mass, after sodium, chloride, magnesium, and sulfate.[1] Calcium an is essential nutrient for almost all living organisms, with vital roles in cellular metabolism, especially with regard to movement of the calcium ion Ca++ into and out of the cytoplasm functions as a signal for many cellular processes. As a chief component needed in mineralization of bones and shells, calcium is the most abundant metal by mass in a large number of faunal species, especially vertebrates, testudines and mollusca. Previous... More »
Public Health Statement for Cesium Last Updated on 2013-09-29 23:45:25 This article is a verbatim version of the original and is not available for edits or additions by EoE editors or authors. Companion articles on the same topic that are editable may exist within the EoE. April 2004 CAS# 7440-46-2 This Public Health Statement is the summary chapter from the Toxicological profile for cesium. It is one in a series of Public Health Statements about hazardous substances and their health effects. A shorter version, the ToxFAQs™, is also available. This information is important because this substance may harm you. The effects of exposure to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present. For more information, call the ATSDR Information Center at 1-888-422-8737. This public health statement tells you about cesium and the effects of exposure. The... More »
Public Health Statement for Copper Last Updated on 2013-09-28 17:33:53 This article is a verbatim version of the original and is not available for edits or additions by EoE editors or authors. Companion articles on the same topic that are editable may exist within the EoE. September 2004 En Español CAS# 7440-50-8 This Public Health Statement is the summary chapter from the Toxicological Profile for Copper. It is one in a series of Public Health Statements about hazardous substances and their health effects. A shorter version, the ToxFAQs™, is also available. This information is important because this substance may harm you. The effects of [[exposure[[ to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present. For more information, call the ATSDR Information Center at 1-888-422-8737. This public health statement tells you about copper and the... More »
Public Health Statement for Lead Last Updated on 2013-09-26 23:45:31 This article is a verbatim version of the original and is not available for edits or additions by EoE editors or authors. Companion articles on the same topic that are editable may exist within the EoE. September 2005 En Español CAS# 7439-92-1 This Public Health Statement is the summary chapter from the Toxicological Profile for Lead. It is one in a series of Public Health Statements about hazardous substances and their health effects. A shorter version, the ToxFAQs™, is also available.. This information is important because this substance may harm you. The effects of exposure to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present. For more information, call the ATSDR Information Center at 1-888-422-8737. This public health statement tells you about lead and the effects... More »