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  2. Ultralight backpacking - Wikipedia

    en.wikipedia.org/wiki/Ultralight_backpacking

    After shelter, a sleeping system, the backpack and water, food is the biggest contributor to pack weight and an area where substantial gains over traditional backpacking can be made. The basal metabolic rate requirement of food calories (one food calorie is 1000 heat calories , thus sometimes labelled kcal) is approximately 1000 per day per 100 ...

  3. Marine biogeochemical cycles - Wikipedia

    en.wikipedia.org/wiki/Marine_biogeochemical_cycles

    Here, the water is chilled by Arctic temperatures. It also gets saltier because when sea ice forms, the salt does not freeze and is left behind in the surrounding water. The cold water is now more dense, due to the added salts, and sinks toward the ocean bottom. Surface water moves in to replace the sinking water, thus creating a current.

  4. Oligotroph - Wikipedia

    en.wikipedia.org/wiki/Oligotroph

    An example of oligotrophic soils are those on white-sands, with soil pH lower than 5.0, on the Rio Negro basin on northern Amazonia that house very low-diversity, extremely fragile forests and savannahs drained by blackwater rivers; dark water colour due to high concentration of tannins, humic acids and other organic compounds derived from the ...

  5. Soil moisture - Wikipedia

    en.wikipedia.org/wiki/Soil_moisture

    Water moves in soil under the influence of gravity, osmosis and capillarity. [7] When water enters the soil, it displaces air from interconnected macropores by buoyancy, and breaks aggregates into which air is entrapped, a process called slaking. [8] The rate at which a soil can absorb water depends on the soil and its other conditions.

  6. Dissolved organic carbon - Wikipedia

    en.wikipedia.org/wiki/Dissolved_organic_carbon

    Filtered (0.2 μm) coastal marine waters collected at various locations around the United Kingdom. The differences in colour is due to the range of soil-derived carbon input to the coastal water, with dark brown (left) indicating a high soil-derived carbon contribution and near-clear water (right) indicating a low soil-derived carbon contribution.

  7. Soil carbon - Wikipedia

    en.wikipedia.org/wiki/Soil_carbon

    Soil carbon is the solid carbon stored in global soils. This includes both soil organic matter and inorganic carbon as carbonate minerals. It is vital to the soil capacity in our ecosystem. Soil carbon is a carbon sink in regard to the global carbon cycle, playing a role in biogeochemistry, climate change mitigation, and constructing global ...

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