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  2. Ninth grade - Wikipedia

    en.wikipedia.org/wiki/Ninth_grade

    Ninth grade. Ninth grade (also 9th grade or grade 9) is the ninth or tenth year of formal or compulsory education in some countries. It is generally part of middle school or secondary school depending on country. Students in ninth grade are usually 14–15 years old, but in some countries are 15–16.

  3. Internal structure of Earth - Wikipedia

    en.wikipedia.org/wiki/Internal_structure_of_Earth

    The internal structure of Earth are the layers of the Earth, excluding its atmosphere and hydrosphere. The structure consists of an outer silicate solid crust, a highly viscous asthenosphere, and solid mantle, a liquid outer core whose flow generates the Earth's magnetic field, and a solid inner core. Scientific understanding of the internal ...

  4. Outline of Earth sciences - Wikipedia

    en.wikipedia.org/wiki/Outline_of_Earth_sciences

    Pedosphere – The outermost layer of the Earth that is composed of soil and subject to soil formation processes. Outer layers. By composition. Crust (geology) – The outermost solid shell of a rocky planet, dwarf planet, or natural satellite. Moho Discontinuity – The line between the crust and the Earth's mantle.

  5. Randy Cunningham: 9th Grade Ninja - Wikipedia

    en.wikipedia.org/wiki/Randy_Cunningham:_9th...

    Randy Cunningham: 9th Grade Ninja is an animated television series created by Jed Elinoff and Scott Thomas for Disney XD. [2] It was produced by Titmouse, Inc. and Boulder Media Limited for Disney's London-based content hub. [3] Many of the character designs were supplied by Jhonen Vasquez, the creator of Invader Zim. [4]

  6. Earth Revealed: Introductory Geology - Wikipedia

    en.wikipedia.org/wiki/Earth_Revealed:...

    1. "Down to Earth" – Beginning by comparing surface conditions on the planets Venus and Mars with the living landscapes of the Earth to highlight how unique the Earth is, the episode describes the goal of the study of geology and introduces major topics the series addresses, including the Earth's heat engines, plate tectonics, volcanism, earthquakes and seismology, erosion, and natural ...

  7. Earth system science - Wikipedia

    en.wikipedia.org/wiki/Earth_system_science

    Earth system science. An ecological analysis of CO. 2 in an ecosystem. As systems biology, systems ecology seeks a holistic view of the interactions and transactions within and between biological and ecological systems. Earth system science (ESS) is the application of systems science to the Earth. [1][2][3][4] In particular, it considers ...