KSA Reading Grade 8 Practice Questions - Kentucky Summative Assessment Reading - Grade 8 Exam

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Read the excerpt from an article on Kentucky hydrology: 'Kentucky contains one of the world's most famous karst landscapes, characterized by thousands of sinkholes, sinking streams, and extensive underground cave systems. Karst terrain forms when acidic rainwater slowly dissolves soluble bedrock, such as limestone, over millions of years. In regions like Edmonson County, surface water vanishes into subsurface conduits, eventually converging to carve out subterranean passages like Mammoth Cave—the longest known cave system on Earth.' Which explicit fact about karst landscapes is directly stated in the text?

Karst landscapes are formed when acidic rainwater dissolves soluble bedrock like limestone. Underground cave systems in karst regions are formed primarily by rapid volcanic activity. Surface streams in karst terrain flow faster than underground rivers due to steep slopes. Edmonson County is the only region in North America containing soluble limestone rock.

Correct Answer:

Karst landscapes are formed when acidic rainwater dissolves soluble bedrock like limestone.

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