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  2. List of unsolved problems in geoscience - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Was there ever a collision of the Earth with another planet Theia, giving birth to the Moon? [1] There is compelling evidence, such as measures of a shorter duration of the Earth's rotation and lunar month in the past, pointing to a Moon much closer to Earth during the early stages of the Solar System.

  3. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    While base ten is normally used for scientific notation, powers of other bases can be used too, [25] base 2 being the next most commonly used one. For example, in base-2 scientific notation, the number 1001 b in binary (=9 d) is written as 1.001 b × 2 d 11 b or 1.001 b × 10 b 11 b using binary numbers (or shorter 1.001 × 10 11 if binary ...

  4. Googol - Wikipedia

    en.wikipedia.org/wiki/Googol

    To put in perspective the size of a googol, the mass of an electron, just under 10 −30 kg, can be compared to the mass of the visible universe, estimated at between 10 50 and 10 60 kg. [5] It is a ratio in the order of about 10 80 to 10 90 , or at most one ten-billionth of a googol (0.00000001% of a googol).

  5. List of Indian inventions and discoveries - Wikipedia

    en.wikipedia.org/wiki/List_of_Indian_inventions...

    The notation was based on the binary and decimal systems. 83% of the weights which were excavated from the above three cities were cubic, and 68% were made of chert. [ 158 ] Technical standards – Technical standards were being applied and used in the Indus Valley civilisation since the 5th millennium BCE to enable gauging devices to be ...

  6. Earth science - Wikipedia

    en.wikipedia.org/wiki/Earth_science

    Physical geography is the study of Earth's systems and how they interact with one another as part of a single self-contained system. It incorporates astronomy, mathematical geography, meteorology, climatology, geology, geomorphology, biology, biogeography, pedology, and soils geography.

  7. Latitude - Wikipedia

    en.wikipedia.org/wiki/Latitude

    In geography, latitude is a geographic coordinate that specifies the north-south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from −90° at the south pole to 90° at the north pole, with 0° at the Equator .

  8. Quantitative geography - Wikipedia

    en.wikipedia.org/wiki/Quantitative_geography

    [3] [5] [6] [7] This has received criticism, and in recent years, quantitative geography has moved to include systematic model creation and understanding the limits of their models. [ 6 ] [ 8 ] [ 9 ] This approach is used to study a wide range of topics, including population demographics, urbanization, environmental patterns, and the spatial ...

  9. Salinity - Wikipedia

    en.wikipedia.org/wiki/Salinity

    [5] Whatever pore size is used in the definition, the resulting salinity value of a given sample of natural water will not vary by more than a few percent (%). Physical oceanographers working in the abyssal ocean , however, are often concerned with precision and intercomparability of measurements by different researchers, at different times, to ...

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