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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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阿爾法粒子
Energy; Nuclear energy
帶正電荷的離子從某些放射性元素的原子核自發地彈出。它是一個有品質數的 4 + 2 的靜電荷的氦核相同的 。它具有低的穿透力和距離很短 (空氣中幾釐米) 的 。最高能 α 粒子將通常不能穿透的細胞覆蓋皮膚,死了的圖層,可以輕鬆地停下來的一張紙。Alpha 發光的同位素是身體內部時,Α 粒子都是危險的。 ...