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  2. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    The mass of the oceans is approximately 1.35 × 10 18 metric tons or about 1/4400 of Earth's total mass. The oceans cover an area of 361.8 million km 2 (139.7 million sq mi) with a mean depth of 3,682 m (12,080 ft), resulting in an estimated volume of 1.332 billion km 3 (320 million cu mi). [193]

  3. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    v. t. e. The history of mathematics deals with the origin of discoveries in mathematics and the mathematical methods and notation of the past. Before the modern age and the worldwide spread of knowledge, written examples of new mathematical developments have come to light only in a few locales.

  4. Geography - Wikipedia

    en.wikipedia.org/wiki/Geography

    e. Geography (from Ancient Greek γεωγραφία geōgraphía; combining gê 'Earth' and gráphō 'write') is the study of the lands, features, inhabitants, and phenomena of Earth. [1] Geography is an all-encompassing discipline that seeks an understanding of Earth and its human and natural complexities —not merely where objects are, but ...

  5. Hipparchus - Wikipedia

    en.wikipedia.org/wiki/Hipparchus

    Hipparchus (/ hɪˈpɑːrkəs /; Greek: Ἵππαρχος, Hípparkhos; c.190 – c. 120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, [ 1 ] but is most famous for his incidental discovery of the precession of the equinoxes. [ 2 ] Hipparchus was born in Nicaea, Bithynia, and probably ...

  6. Glossary of geography terms (N–Z) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geography_terms...

    N. [edit] nadir. narrows. Also narrow. A land or water passage that is confined or restricted by its narrow breadth, often a strait or a water gap. nation. A stable community of people formed on the basis of a common geographic territory, language, economy, ethnicity, or psychological make-up as manifested in a common culture.

  7. Earth science - Wikipedia

    en.wikipedia.org/wiki/Earth_science

    Earth science or geoscience includes all fields of natural science related to the planet Earth. [ 1 ] This is a branch of science dealing with the physical, chemical, and biological complex constitutions and synergistic linkages of Earth's four spheres: the biosphere, hydrosphere / cryosphere, atmosphere, and geosphere (or lithosphere).

  8. Arctic Ocean - Wikipedia

    en.wikipedia.org/wiki/Arctic_Ocean

    The Arctic Ocean is the smallest and shallowest of the world's five oceanic divisions. [ 1 ] It spans an area of approximately 14,060,000 km 2 (5,430,000 sq mi) and is the coldest of the world's oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, although some oceanographers call it the Arctic Mediterranean Sea ...

  9. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A unit fraction is a common fraction with a numerator of 1 (e.g., ⁠ 1 / 7 ⁠). Unit fractions can also be expressed using negative exponents, as in 2 −1, which represents 1/2, and 2 −2, which represents 1/(2 2) or 1/4. A dyadic fraction is a common fraction in which the denominator is a power of two, e.g. ⁠ 1 / 8 ⁠ = ⁠ 1 / 2 3 ⁠.

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