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  2. AP World History: Modern - Wikipedia

    en.wikipedia.org/wiki/AP_World_History:_Modern

    In 2012, the head of AP Grading, Trevor Packer, stated that the reason for the low percentages of 5s is that "AP World History is a college-level course, & many sophomores aren't yet writing at that level." 10.44 percent of all seniors who took the exam in 2012 received a 5, while just 6.62 percent of sophomores received a 5.

  3. Water cycle - Wikipedia

    en.wikipedia.org/wiki/Water_cycle

    2 O has smaller molecular mass than the major components of the atmosphere, nitrogen (N 2) and oxygen (O 2) and hence is less dense. Due to the significant difference in density, buoyancy drives humid air higher. As altitude increases, air pressure decreases and the temperature drops (see Gas laws). The lower temperature causes water vapor to ...

  4. Marine biogeochemical cycles - Wikipedia

    en.wikipedia.org/wiki/Marine_biogeochemical_cycles

    Water is the medium of the oceans, the medium which carries all the substances and elements involved in the marine biogeochemical cycles. Water as found in nature almost always includes dissolved substances, so water has been described as the "universal solvent" for its ability to dissolve so many substances.

  5. Biogeochemical cycle - Wikipedia

    en.wikipedia.org/wiki/Biogeochemical_cycle

    The biotic compartment is the biosphere and the abiotic compartments are the atmosphere, lithosphere and hydrosphere. For example, in the carbon cycle, atmospheric carbon dioxide is absorbed by plants through photosynthesis , which converts it into organic compounds that are used by organisms for energy and growth.

  6. Earth system interactions across mountain belts - Wikipedia

    en.wikipedia.org/wiki/Earth_system_interactions...

    The hydrosphere refers to all water on, under, and above the surface of the Earth. It includes the gaseous , liquid , and solid forms of water. Hydrospheric processes which operate across mountain belts include ocean circulation , groundwater flow , evaporation , and condensation .

  7. AP United States Government and Politics - Wikipedia

    en.wikipedia.org/wiki/AP_United_States...

    Advanced Placement (AP) United States Government and Politics (often shortened to AP Gov or AP GoPo and sometimes referred to as AP American Government or simply AP Government) is a college-level course and examination offered to high school students through the College Board's Advanced Placement Program.

  8. AP sources: Biden OKs huge Willow oil project in Alaska - AOL

    www.aol.com/news/ap-sources-biden-oks-huge...

    Biden's plan would allow three drill sites initially, the sources said, which project developer ConocoPhillips has said would include about 219 total wells. AP sources: Biden OKs huge Willow oil ...

  9. Hydrosphere - Wikipedia

    en.wikipedia.org/wiki/Hydrosphere

    The hydrosphere (from Ancient Greek ὕδωρ (húdōr) ' water ' and σφαῖρα (sphaîra) ' sphere ') [1] [2] is the combined mass of water found on, under, and above the surface of a planet, minor planet, or natural satellite. Although Earth's hydrosphere has been around for about 4 billion years, [3] [4] it continues to