Mesto

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Limestone

Science / Geology / Limestone: A sedimentary rock consisting of at least 50% calcium carbonate (CaCO2) by weight. Picture of Limestone. MORE

Carbon

Science / Chemistry / Carbon: An element with atomic number 6. Carbon is a nonmetal found in all organic compounds. Carbon occurs naturally as diamond, graphite, and buckminsterfullerene. MORE

Oxygen

Science / Chemistry / Oxygen: Element 8, atomic weight 15.9994, a colorless, odorless gas that makes up about 1/5 of the earth's atmosphere and (in combined form) 8/9ths of earth's oceans and almost half of the earth's crust. The MORE

Colonial Period

Entertainment / Literature / Colonial Period: American and British historians use this term somewhat differently. American scholars usually use the term 'colonial period' to refer to the years in the American colonies before the American Revoluti MORE

Calcium (Ca)

Science / Periodic Table of Elements / Calcium (Ca): Atomic number: 20, Atomic mass: 40.08 g.mol -1, Electronegativity: 1.0, Mass volume: 1.6 g.cm-3 at 20?°C, Melting point: 840 ?°C, Boiling point: 1484 ?°C, Vanderwaals radius: 0.197 nm, Ionic radius MORE

Carbon (C)

Science / Periodic Table of Elements / Carbon (C): Atomic number: 6, Atomic mass: 12.011 g.mol -1, Electronegativity: 2.5, Density: 2.2 g.cm-3 at 20?°C, Melting point: 3652 ?°C, Boiling point: 4827 ?°C, Vanderwaals radius: 0.091 nm, Ionic radius: 0 MORE