[TOEFL iBT] Factual Information Trap Dissection | AceThePrep

TOEFL iBTReadingFactual Information

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Passage: 'In atmospheric chemistry, stratospheric ozone depletion is accelerated by polar stratospheric clouds (PSCs), which form exclusively during winter darkness when temperatures drop below -78°C. PSC ice crystals provide heterogeneous catalytic surfaces that convert inert chlorine reservoir species (such as HCl and ClONO2) into photolytically active molecular chlorine (Cl2). When sunlight returns in spring, UV radiation cleaves Cl2 into free chlorine radicals, initiating catalytic ozone destruction cycles.'

According to the passage, what specific catalytic function do polar stratospheric clouds perform in ozone depletion?

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Practice More TOEFL iBT Factual Information Questions

More Factual Information Questions in TOEFL iBT