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  2. Substrate (aquarium) - Wikipedia

    en.wikipedia.org/wiki/Substrate_(aquarium)

    For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

  3. Tumble finishing - Wikipedia

    en.wikipedia.org/wiki/Tumble_finishing

    Parts breakdown. Tumble finishing, also known as tumbling or rumbling, [1] is a technique for smoothing and polishing a rough surface on relatively small parts. In the field of metalworking, a similar process called barreling, or barrel finishing, [2] works upon the same principles. Tumbled stones are made with rock tumblers in a process very ...

  4. Aquarium - Wikipedia

    en.wikipedia.org/wiki/Aquarium

    A freshwater aquarium with plants and various tropical fish. An aquarium (pl.: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic reptiles, such as turtles, and aquatic plants.

  5. Solar thermal collector - Wikipedia

    en.wikipedia.org/wiki/Solar_thermal_collector

    A solar thermal collector collects heat by absorbing sunlight. The term "solar collector" commonly refers to a device for solar hot water heating, but may refer to large power generating installations such as solar parabolic troughs and solar towers or non- water heating devices such as solar cookers or solar air heaters. [1]

  6. Okinawa Churaumi Aquarium - Wikipedia

    en.wikipedia.org/wiki/Okinawa_Churaumi_Aquarium

    It holds 7,500,000 litres (1,981,000 US gal) of water and features an acrylic glass panel measuring 8.2 by 22.5 metres (27 by 74 ft) with a thickness of 60 centimetres (2 ft), [34] the largest such panel in the world when the aquarium was opened. [4] [35] Whale sharks and manta rays are kept alongside many other fish species in the main tank. [4]

  7. Court orders South Korea to specify plans to cut carbon ...

    www.aol.com/news/court-orders-south-korea...

    South Korea’s Constitutional Court on Thursday ordered the government to back its climate goals with more concrete plans for action through 2049, handing a partial victory to climate campaigners ...

  8. Construction aggregate - Wikipedia

    en.wikipedia.org/wiki/Construction_aggregate

    Chipseal aggregate on Ellsworth Road in Tomah, Wisconsin. Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world.

  9. He stumbled onto a large tusk in a Mississippi creek. It ...

    www.aol.com/news/nearly-600-pound-ice-age...

    A fossil hunter was scouring a Mississippi creek for remnants of the past when he came across the discovery of a lifetime — a tusk from an ice age Columbian mammoth.

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