Nature Guide Rocks and Minerals (DK Nature Guide)

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Heinen, Wouter; Oehler, John H. (1979). "Evolutionary Aspects of Biological Involvement in the Cycling of Silica". In Trudinger, P.A.; Swaine, D.J. (eds.). Biogeochemical Cycling of Mineral-Forming Elements. Amsterdam: Elsevier. p.431. ISBN 9780080874623 . Retrieved 13 April 2020. A mineral is a naturally occurring substance with distinctive chemical and physical properties, composition and atomic structure. Other Recommended Aquarium Decorations are our Aquarium Gravel by Pure Water Pebbles ®. Pure Water Pebbles ®aquarium gravel is great for aquariums, ponds, gardens and architectural surfaces. Heat sanitized, hand washed, safe for your fish, and ready to be added to your aquarium.

Bjorhovde, Reidar (2004). "Development and use of high performance steel". Journal of Constructional Steel Research. 60 (3–5): 393–400. doi: 10.1016/S0143-974X(03)00118-4. Ashurst, John; Dimes, Francis G. (1998). Conservation of building and decorative stone. Butterworth-Heinemann. p.117. ISBN 978-0-7506-3898-2.Organic material: dead or decaying matter found at the top of soil. This lies just on top of the topsoil. Arthur, M.A., Dean, W.E., Stow, D.A.V., 1984, Models for the deposition of Mesozoic-Cenozoic fine-grained organic-carbon-rich sediment in the deep sea, The Geological Society, 15, pp. 527–560

O'Hara, Kieran D. (2018). "The Structure of Geological Revolutions". A Brief History of Geology (1ed.). Cambridge University Press. pp.247–259. doi: 10.1017/9781316809990.013. ISBN 978-1-316-80999-0.Nesse, William D. (2000). Introduction to mineralogy. New York: Oxford University Press. ISBN 9780195106916. The inspiration for the unofficial anthem of Yorkshire ‘On Ilkla Moor Baht ‘at’, Ilkley Moor spans 676 acres of green space between Ilkley and Keighley. Sitting at 402 metres above sea level, it offers picture-perfect panoramas of the Yorkshire Dales. Cross the heather-strewn countryside to discover landmarks like The Ilkley Crags and The Twelve Apostles Stone Circle – Yorkshire’s answer to Stonehenge! Sand and gravel on beaches or in river bars look like the sandstone and conglomerate that they will eventually become.

Allen, Carlton; Allton, Judith; Lofgren, Gary; Righter, Kevin; Zolensky, Michael (2011). "Curating NASA's extraterrestrial samples—Past, present, and future". Geochemistry. 71 (1): 1–20. Bibcode: 2011ChEG...71....1A. doi: 10.1016/j.chemer.2010.12.003. hdl: 2060/20100042395. Sandy soil has anything from 80-100% sand in it while clay soil is anything from 50-100% clay. Loam soils can have between 10-30% of clay and between 25-50% of sand. Loam soils also contain anything from 30-50% of silt. There are lots of variations of these soil types

Hull Pot

Boggs, Sam (2006). Principles of sedimentology and stratigraphy (4thed.). Upper Saddle River, N.J.: Pearson Prentice Hall. ISBN 0131547283. A huge collapsed cavern on the west side of Pen-y-Ghent, Hull Pot is one of Yorkshire’s more intriguing natural wonders. The chasm is 300-foot long, 60-foot wide and 60-foot deep. It even holds the record for England’s largest natural hole! In heavy rain, the stream at the top pours over the lip of the pot, creating a spectacular waterfall. In really stormy weather, the flood waters have actually filled the Hull Pot to the brim!