What is the summary for this?

as you drive through the gently rolling countryside of missouri, you would not suspect that nature was operating a factory beneath the road. not just a factory, but also a complex manufacturing system all hidden underground.
operating 24 hours a day, seven days a week for untold ages, this cave factory has created over 6000 caves in missouri alone. the karst areas of the ozarks-generally the southern half of missouri, north arkansas and parts of eastern oklahoma and kansas-are a perfect place for this cave building process to take place. the list of ingredients for making a cave is short. you need plenty of limestone, a mineral that can be dissolved in groundwater. add plenty of rain to supply the groundwater. finally, since water flows downhill, you need what geologists call “relief”-uneven land. there’s no shortage of that in the hilly ozarks.
as it flows beneath the earth’s surface, the groundwater chemically and physically eats away at the limestone. this dissolves and erodes the rock forming the cavities that become caves. the same action also produces cave formations such as stalactites, stalagmites and many others. unless it’s interrupted, this process will continue throughout the life of the cave, until the cave finally deteriorates and is destroyed by nature. sometimes there are remnants-a natural bridge or tunnel, perhaps-to indicate that a cave was once there.
the process that left the ozarks honeycombed with caves, springs and sinkholes is an extremely slow one. due to the varying rates of water flow and chemical activity it is very difficult to determine the age of the caves. the caves of the ozarks are very old, but we really don’t know exactly how old they are.
there are over 6,000 caves located in the state of missouri alone. out of this 6,000 caves, 22 of the caves and caverns are members of the missouri caves association. the purpose of the association is to promote interest, goodwill cooperation and courtesy among the owners and operators of these commercial caves. all the members in missouri work to promote a greater public interest in the caves in this area. they work together to deal with business matters that concern all in the area of promoting and publicizing the missouri cave industry. the 22 members represent a wide variety of caves and caverns and the attractions located within each. while a great deal of the issues dealt with by the missouri caves association is not seen by the general public, the members all share a common goal. it is the desire of the mca to promote the conservation and preservation of missouri caves both commercial and wild and to protect visitors or guests in the use and enjoyment of these natural phenomenon.