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  2. Abundance of elements in Earth's crust - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_elements_in...

    Abundance (atom fraction) of the chemical elements in Earth's upper continental crust as a function of atomic number; [5] siderophiles shown in yellow Graphs of abundance against atomic number can reveal patterns relating abundance to stellar nucleosynthesis and geochemistry.

  3. Abundance of the chemical elements - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_the_chemical...

    The abundance of the chemical elements is a measure of the occurrences of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by mass fraction (in commercial contexts often called weight fraction), by mole fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases), or by volume fraction.

  4. List of environmental dates - Wikipedia

    en.wikipedia.org/wiki/List_of_environmental_dates

    Ecological Debt Day (Earth Overshoot Day) September 23 in 2008, but receding World Gorilla Day [129] [130] [131] September 24 World Environmental Health Day [132] September 26 since 2011 [133] World Cassowary Day [134] [135] September 26 International Day of Awareness of Food Loss and Waste [136] September 29 World Rivers Day [137] Last Sunday ...

  5. Biological roles of the elements - Wikipedia

    en.wikipedia.org/wiki/Biological_roles_of_the...

    Essential to almost all living things, usually as a ligand in a protein; it is most familiar as an essential element in the protein hemoglobin. [11] Toxic in some forms. [11] krypton: 36: 1: As with other noble gases, has no known biological role. [11] It is also the rarest non-radioactive element in the Earth's crust. [3] None known. lanthanum ...

  6. CHNOPS - Wikipedia

    en.wikipedia.org/wiki/CHNOPS

    Graphic representation of carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur. CHNOPS and CHON are mnemonic acronyms for the most common elements in living organisms. . "CHON" stands for carbon, hydrogen, oxygen, and nitrogen, which together make up more than 95 percent of the mass of biological system

  7. List of animal rights groups - Wikipedia

    en.wikipedia.org/wiki/List_of_animal_rights_groups

    This list of animal rights groups consists of groups in the animal rights movement.Such animal rights groups work towards their ideals, which include the viewpoint that animals should have equivalent rights to humans, such as not being "used" in research, food, clothing and entertainment industries, and seek to end the status of animals as property. [1]

  8. Environmental issues - Wikipedia

    en.wikipedia.org/wiki/Environmental_issues

    Environmental law is the collection of laws, regulations, agreements and common law that governs how humans interact with their environment. [63] This includes environmental regulations; laws governing management of natural resources , such as forests , minerals , or fisheries; and related topics such as environmental impact assessments .

  9. Carbon-based life - Wikipedia

    en.wikipedia.org/wiki/Carbon-based_life

    Carbon is a primary component of all known life on Earth, and represents approximately 45–50% of all dry biomass. [1] Carbon compounds occur naturally in great abundance on Earth. Complex biological molecules consist of carbon atoms bonded with other elements , especially oxygen and hydrogen and frequently also nitrogen , phosphorus , and ...

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