Answer:
Some regions don't have limestone under or in their soil.
Explanation:
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum.
Karst topography only exist in some geographic locations, are most regions have rock layers other than limestone. Thus, option (a) is correct.
What is Karst topography?
When the bedrock is composed of carbonate-rich rock, such as limestone, gypsum, or dolomite, which dissolves readily, karst topography typically develops in areas with heavy rainfall.
A certain kind of sedimentary rock, like gypsum, dolomite, or limestone, dissolves over time, creating a landscape known as karst. Numerous caverns, fissures, sinkholes, and underground streams define it.
As a result, option (a) is the accurate.
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