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【02. GEOGRAPHY 地理學】 karst topography 溶蝕地形
　
1. sinkhole [ˋsɪŋk͵hol] n. 滲穴
A sinkhole is a hollow in a land surface communicating with a cavern, occurring in limestone regions.　
　
2. stalactite [stəˋlæktaɪt] n. 鐘乳石
Stalactite is the conical formation of lime hanging from the roof of a cave.　　
　
3. stalagmite [stəˋlægmaɪt] n. 石筍
A stalagmite is a deposit of calcium carbonate built up on the floor of a cave, formed by the slow dropping of water containing the mineral lime.　
　
4. resurgence [rɪˋsɝdʒəns] n. 再現溪流
In geography, a resurgence is an underground river which reaches the surface and becomes a surface stream.　
　
5. limestone [ˋlaɪm͵ston] n. 石灰石
Limestone is a light grey rock that is formed chiefly by accumulation of calcium carbonate.