Encyclopedia of Earth
Encyclopedia of Earth: Zirconium
Information about the element Zirconium, atomic number 40. Covers history of its discovery, sources, physical properties, atomic properties, how abundant it is on the Earth, details about permissible exposure, uses, and possible...
Encyclopedia of Earth
Encyclopedia of Earth: Zinc
Information about the element, Zinc, atomic number 30. Covers physical and chemical properties, how abundant it is on the Earth, where it occurs, isotopes, zinc in the environment, its role in human health, and the history of its use in...
Encyclopedia of Earth
Encyclopedia of Earth: Ytterbium
Information about the element, Ytterbium, atomic number 70. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations.
Encyclopedia of Earth
Encyclopedia of Earth: Entomology: Yellow Fever
Information about yellow fever, a disease transmitted by mosquitoes in tropical areas. The article discusses how to prevent yellow fever, and how the disease affects a person. (Published: February 28, 2008)
Encyclopedia of Earth
Encyclopedia of Earth: Noise Pollution: Wind Power
Discusses wind energy, how it is created, its history, benefits, negative effects, and what the future holds for this alternative energy source.
Encyclopedia of Earth
Encyclopedia of Earth: Botany: White Fir
Article on white fir tree. Covers ways it is used by humans, distribution, physical features, habitat, and forest management. (Published: October 6, 2009)
Encyclopedia of Earth
Encyclopedia of Earth: Microbiology: Virus
Article explaining what viruses are, their evolution, taxonomy, morphology, and replication. Also covers mechanisms by which viruses cause disease, how they can impact on plants, and the potential and real benefits we get from...
Encyclopedia of Earth
Encyclopedia of Earth: Vertebrate
Explains the features of animals defined as vertebrates, how they evolved, and their taxonomy. (Published: April 29, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Physics & Chemistry: Gas
Discusses gas as a state of matter, the history and use of the terms vapor and gas, and types of elemental gases.
Encyclopedia of Earth
Encyclopedia of Earth: Vanadium
Information about the element, Vanadium, atomic number 23. Covers its history, sources, physical and atomic properties, prevalence on the Earth, details about any health-related regulations, uses, and possible substitutes.
Encyclopedia of Earth
Encyclopedia of Earth: Conservation Biology: Polar Bear
Information about the polar bear: physical characteristics, behavior, life cycle, distribution, threats to their survival, conservation efforts, etc. (Published Sept. 7, 2011)
Encyclopedia of Earth
Encyclopedia of Earth: Uranium
Information about the radioactive element, Uranium, atomic number 92. Describes its history, physical and atomic properties, how abundant it is on the Earth, and permissible exposure limits. Also discusses sources, uses, isotopes,...
Encyclopedia of Earth
Encyclopedia of Earth: Titanium
Information about the element, Titanium, atomic number 22. Covers its initial discovery, physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations. Also discusses sources, uses,...
Encyclopedia of Earth
Encyclopedia of Earth: Thulium
Information about the element, Thulium, atomic number 69. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations.
Encyclopedia of Earth
Encyclopedia of Earth: Thorium
Information about the element, Thorium, atomic number 90. Covers physical properties, atomic properties, how abundant it is on the Earth, where it is found, and details about health-related regulations. Discusses thorium's potential use...
Encyclopedia of Earth
Encyclopedia of Earth: Huxley, Thomas Henry
A biography of Thomas Henry Huxley, a contemporary of Charles Darwin, and a strong supporter of his theory of evolution.
Encyclopedia of Earth
Encyclopedia of Earth: Tantalum
A description of the element, Tantalum, atomic number 73. Covers the origin of its name, sources, uses for it in industry, and possible substitutes.
Encyclopedia of Earth
Encyclopedia of Earth: Sulfur
Information about the element, Sulfur, atomic number 16. Covers physical and atomic properties, its history, chemistry, sources, uses, how abundant it is on the Earth, environmental and biological factors, and the different forms in...
Encyclopedia of Earth
Encyclopedia of Earth: Strontium
Information about the element, Strontium, atomic number 38. Covers its history, sources, physical properties, atomic properties, how abundant it is on the Earth, details about permissible exposure, uses, and possible substitutes.
Encyclopedia of Earth
Encyclopedia of Earth: Botany: Stomata
Article discussing the structure, function, and efficiency of stomata, the apertures on plants' leaves that regulate gas and water vapor exchange during photosynthesis. (Published: August 3, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Biodiversity: Species
Defines the term species and the origin of the concept. Provides estimates of numbers of species in different biological categories, explains what endangered species are, and what ring species are. (Published: May 26, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Energy: Solar Power
Explains what solar power is, how it is produced, its limitations as an alternative energy source, environmental issues, the importance of analyzing solar power systems on an ongoing basis, and geographical considerations. (Published:...
Encyclopedia of Earth
Encyclopedia of Earth: Sodium
Information about the element, Sodium, atomic number 11. Covers physical and atomic properties, how abundant it is on the Earth, and human health considerations.
Encyclopedia of Earth
Encyclopedia of Earth: Silver
Information about the element, Silver, atomic number 47. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations and effects from exposure to it. Also discusses...