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Speleology
Speleology (also spelled spelæology or spelaeology) is the scientific study of caves and other karst features, their make-up, structure, physical properties, history, life forms, and the processes by which they form (speleogenesis) and change over time (speleomorphology). The term speleology is also sometimes applied to the recreational activity of exploring caves, but this is more properly known as caving, spelunking or potholing. Speleology and caving are often connected, as the physical skills required for in situ study are the same. Speleology is a cross-disciplinary field that combines the knowledge of chemistry, biology, geology, physics, meteorology and cartography to develop portraits of caves as complex, evolving systems.
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查卡塔克裡克
Water bodies; Rivers
查卡塔克裡克是 13.3 英里長在美國 詹姆斯河的支流弗吉尼亞州。克裡克在維特島縣升起和流動到查卡塔克在哪裡它轉向東北經過國家路線 10/狀態路由 32 下的薩福克郡城東南。潮,克裡克繼續東北口克裡克的啤酒,它大大拓寬,維特島縣和薩福克郡城之間的界限變得愈發。如果克裡坦登克裡坦登橋 (美國 路線 17) 下的收益和木條灣詹姆士河上游。 ...
平面多邊形
Earth science; Mapping science
(1) 完全位於一個平面多邊形。(2) A 部分的直線為界的平面。這個定義和前面的一是約相等。(3) 通過選擇一個序列點 P 1 、 P 2 ,形成的幾何圖...P N 上飛機,由一條直線,有兩個點作為結束點,和最後一點,P N ,加入由類似直線的第一點,P 1 、 加入序列中的每個點下, 一。(4) A 平面圖組成的 N 直線和 N ...