Environmental
Iowa ranks among the states with the highest percentage of homes with elevated radon levels primarily because:
AIowa has high levels of industrial pollution
BIowa's soil contains uranium-bearing materials that decay into radon gas✓ Correct
CIowa's humid climate traps radon inside homes
DIowa's flat terrain prevents radon from dispersing
Explanation
Iowa's high radon levels are primarily due to the soil and rock containing uranium-bearing materials (granitic glacial deposits) that decay into radium and then into radon gas. The gas seeps upward through the soil and can accumulate in buildings.
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