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  2. Hard landscape materials - Wikipedia

    en.wikipedia.org/wiki/Hard_landscape_materials

    A wide range of hard landscape materials can be used, such as brick, gravel, rock or stone, concrete, timber, bitumen, glass, and metals. Common gravel types include pea gravel and crushed granite gravel. [1] 'Hard landscape' can also describe outdoor furniture and other landscape products.

  3. Gravel - Wikipedia

    en.wikipedia.org/wiki/Gravel

    Pea gravel also known as "pea shingle" is clean gravel similar in size to garden peas. [31] Used for concrete surfaces, walkways, driveways and as a substrate in home aquariums. Piedmont gravel a coarse gravel carried down from high places by mountain streams and deposited on relatively flat ground, where the water runs more slowly. [32 ...

  4. Frost heaving - Wikipedia

    en.wikipedia.org/wiki/Frost_heaving

    Photograph taken 21 March 2010 in Norwich, Vermont. Frost heaving (or a frost heave) is an upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil (the freezing front or freezing boundary).

  5. Hardiness zone - Wikipedia

    en.wikipedia.org/wiki/Hardiness_zone

    X 4 = monthly mean of the daily maximum temperatures (°C) of the warmest month; X 5 = winter factor expressed in terms of (0 °C – X 1)Rjan where Rjan represents the rainfall in January expressed in mm; X 6 = mean maximum snow depth in terms of S/(S+a) where a=25.4 if S is in millimeters and a=1 if S is in inches

  6. Gravel pit - Wikipedia

    en.wikipedia.org/wiki/Gravel_pit

    Gravel pit lakes are typically nutrient rich and can support thriving ecosystems, but can also present environmental issues such as the release of toxic metals into watersheds from the exposed rock. [2] Old, abandoned gravel pits are normally used either as nature reserves, or as amenity areas for water sports, landfills and walking.

  7. File:Temperature-relative humidity chart - PMV method.pdf

    en.wikipedia.org/wiki/File:Temperature-relative...

    The representation is made on a temperature-relative humidity, instead of a standard psychrometric chart. The comfort zone in blue represents the 90% of acceptability, which means the conditions between -0.5 and +0.5 PMV, or PPD < 10%.

  8. Seasonal thermal energy storage - Wikipedia

    en.wikipedia.org/wiki/Seasonal_thermal_energy...

    A ground source heat pump is used in winter to extract the warmth from the Thermal Bank to provide space heating via underfloor heating. A high Coefficient of performance is obtained because the heat pump starts with a warm temperature of 25 °C (77 °F) from the thermal store, instead of a cold temperature of 10 °C (50 °F) from the ground. [17]

  9. Gravel road - Wikipedia

    en.wikipedia.org/wiki/Gravel_road

    A gravel road in Asikkala, Finland. A gravel road is a type of unpaved road surfaced with gravel that has been brought to the site from a quarry or stream bed.Gravel roads are common in less-developed nations, and also in the rural areas of developed nations such as Canada and the United States.