- sieve pit
- noun
: one of the fine perforations that occur in a sieve plate
Useful english dictionary. 2012.
Useful english dictionary. 2012.
Pit connection — In Plant anatomy, a pit connection is a hole in the septum between two algal cells, and is found only in the red algae[1] specifically, all orders except the Porphyridiales and haploid Bangiales.[2] They are often stoppered with pit plugs . They… … Wikipedia
angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction any member of the more than 300,000 species of flowering plants (division Anthophyta) … Universalium
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Mining in the Upper Harz — The headframe of the Emperor William Shaft in Clausthal is one of the oldest surviving winding towers in Germany … Wikipedia
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agriculture, origins of — Introduction the active production of useful plants or animals in ecosystems that have been created by people. Agriculture has often been conceptualized narrowly, in terms of specific combinations of activities and organisms wet rice production… … Universalium
Ceramics of indigenous peoples of the Americas — Moche portrait vessel, Musée du quai Branly, ca. 100 700 CE, 16 x 29 x 22 cm … Wikipedia
Zeolite — Zeolites (Greek, zein , to boil ; lithos , a stone ) are hydrated aluminosilicate minerals and have a micro porous structure. The term was originally coined in the 18th century by a Swedish mineralogist named Axel Fredrik Cronstedt who observed,… … Wikipedia
Sandpit — A sandpit or sandbox is a low, wide container or shallow depression filled with sand in which children can play. Many homeowners with children build sandpits in their backyards because, unlike much playground equipment, they can be easily and… … Wikipedia