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2. Gravel - Wikipedia

   en.wikipedia.org/wiki/Gravel

   ISO 14688 grades gravels as fine, medium, and coarse, with ranges 2–6.3 mm (0.079–0.248 in) for fine and 20–63 mm (0.79–2.48 in) for coarse. One cubic metre of gravel typically weighs about 1,800 kg (4,000 lb), or one cubic yard weighs about 3,000 lb (1,400 kg). Gravel is an important commercial product, with a number of applications.

3. Mulch - Wikipedia

   en.wikipedia.org/wiki/Mulch

   The effect of mulch upon soil moisture content is complex. Mulch forms a layer between the soil and the atmosphere reducing evaporation. [11] However, mulch can also prevent water from reaching the soil by absorbing or blocking water from light rains and overly thick layers of mulch can reduce oxygen in the soil. [12]

4. Hydraulic conductivity - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_conductivity

   Sand or gravel aquifers would thus be easier to extract water from (e.g., using a pumping well) because of their high transmissivity, compared to clay or unfractured bedrock aquifers. Hydraulic conductivity has units with dimensions of length per time (e.g., m/s, ft/day and ( gal /day)/ft 2 ); transmissivity then has units with dimensions of ...

5. Rubber mulch - Wikipedia

   en.wikipedia.org/wiki/Rubber_mulch

   Rubber mulch typically consists of waste tire bits or nuggets of synthetic rubber obtained from tires that have been shredded or ground up whole, with their steel bands removed. This process can involve the use of various types of tires, including those from passenger vehicles, large trucks , and trailers .

6. Plastic mulch - Wikipedia

   en.wikipedia.org/wiki/Plastic_mulch

   Plastic mulch is often used in conjunction with drip irrigation. Some research has been done using different colors of mulch to affect crop growth. Use of plastic mulch is predominant in large-scale vegetable growing, with millions of acres cultivated under plastic mulch worldwide each year. [1] Disposal of plastic mulch is an environmental ...

7. Ready-mix concrete - Wikipedia

   en.wikipedia.org/wiki/Ready-mix_concrete

   Ready-mix concrete refers to concrete that is specifically manufactured for customers' construction projects, and supplied to the customer on site as a single product. It is a mixture of Portland or other cements, water and aggregates: sand, gravel, or crushed stone. [5]