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Rio Grande, Spanish Río Grande del Norte, or (in Mexico) Río Bravo, or Río Bravo del Norte, fifth longest river of North America, and the 20th longest in the world, forming the border between the U.S. state of Texas and Mexico.

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The mean distance of the earth from the sun is approximately 149,502,000 km.

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The tropical and temperate deserts of the world, occupy nearly 1/7th of the land surface of the worlds.

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The pedogenic process associated with poor drainage and which involves the accumulation of organic matter in the upper layers of the soil is called gleisation.

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The progressive wave theory regarding of tides was put forth by William Whewell.

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The pyramidal peaks that form when several cirques chisel a mountain form three more sides are called horns.

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The groundwater can become confined between two impermeable layers. This type of enclosed water is called a artesian.