महासागरीय अम्लीकरण पृथ्वी के महासागरों के pH में निरंतर होने वाली कमी है, जो मुख्य रूप से वायुमंडल से ________ के अवशोषण के कारण होती है।

When the pH of rainwater is less than ______, it is called acid rain.

Burning of plastics, especially Polyvinyl Chloride (PVC), releases which of the following highly toxic substances into the atmosphere?

Which of the following specific chemical compounds is formed when sulphur dioxide reacts with atmospheric moisture during the sulphur cycle?