KSA Reading Grade 5 Practice Questions - Kentucky Summative Assessment Reading - Grade 5 Exam

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Read the passage below. 'Mammoth Cave is formed in limestone. Rainwater absorbed carbon dioxide from decaying plants, creating a weak acid. Over a very long time, that water seeped underground and dissolved limestone, opening passages and chambers.' What is the main idea of the explanation?

Rainwater mixed with plant acid slowly dissolved underground limestone over millions of years. Limestone rock in Kentucky was carved out by early explorers using iron picks. Underground rivers froze solid during the Ice Age and cracked open the rock. Decaying forest plants collapsed into deep holes to form open air pits.

Correct Answer:

Rainwater mixed with plant acid slowly dissolved underground limestone over millions of years.

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