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Alkaline earth contains or consits of an oxides of alkaline earth metals, such as lime, magnesia, strontia, and baryta. The alkaline earth metals are among the most electropositive of all metals, second only to the Group 1 or Alkali metals. Consequently, most of their compounds have a high degree of ionic character. This confers a high degree of basic nature to the oxides. On reacting with water, the corresponding hydroxides are obtained (in solution) which are strong bases. Although highly corrosive, they are used as antacids for their strongly basic nature. The chemical term earths was historically applied to certain chemical substances, once thought to be elements, and this name was borrowed from one of the four classical elements of Plato. ... The alkaline earth metals are the series of elements in Group 2 of the periodic table: beryllium, magnesium, calcium, strontium, barium and radium (not always considered due to its very short half-life). ...
These were named alkalineearths because of their intermediate nature between the alkalis (oxides of the alkali metals) and the rare earths (oxides of rare earthmetals).
The Earth is approximately a slightly oblate spheroid, with an average diameter of approximately 12,742 km.
Earth's plate tectonics recycle carbon and water as limestone rocks are subducted into the mantle and volcanically released as gaseous carbon dioxide and steam.
In Norse mythology, the earth goddess Jord was the mother of Thor and the daughter of Annar.
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