Caves are fissures in the land large enough for a human to enter. A cave can be a tunnel one must crawl through on one's stomach, or they can be cavernous openings in the earth Caves are typically formed by the following forces: Man-made, by explosive force or meticulous mining Worn away by rivers or oceans in soluble rock such as limestone or sandstone Worn away by the elements, such as seasonal rain or disaster such as hurricane or typhoon Caves can be living places for persons or animals, they can be storage facilities; in the days when buildings were made out of less solid materials such as clay, straw, or wood which was subject to fire and rot, caves were desirable for dugout houses and also for barns to house animals in, as the earth was more durable than the above materials. Caves can have stalactites and stalagmites if there is moisture to drip materials from the ceiling to the floor, the deposits piling up, but dry caves in deserts and other arid ecosystems are far more likely to not have stalactites and stalacmites In this exercise, invent a cave in your world. Cave's Name (optional): Cave's use: Who/what lives there: Does any plant life live inside: Is there one exit or many: Is it tunnels or a simple cavern: Are the cave walls/floor/ceiling smooth or rough? Are there stalactites/stalagmites? Are there other materials built up inside (sand, gravel, soil, etc) Are there water systems in the cave? What formed the cave? Is it recently formed, or older? What kind of ecosystem (desert, swamp, mountain etc) is it in?