Troglotopia Cave Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.Solutional caves are formed in the earth when a soft rock, usually limestone, is eroded by rainwater that has mixed with soils and carbon dioxide to form carbonic acid. Troglotopia Cave and the surrounding earth contain low amounts of soft rock, so it is not a solutional cave. For purposes of evaluating the argument it would be most useful to establish which of the following? Whether soft rock is commonly eroded by any substance other than carbonic acid Whether carbonic acid commonly erodes away most of the soft rock in a given area Whether rainwater that mixed with soils and atmosphere ever forms an acid other than carbonic acid Whether Troglotopia Cave is of a shape commonly seen in caves known to be solutional caves Whether there are areas of soft rock where caves commonly fail to form even when exposed to carbonic acid Review Answer