Tag Archives: Atmosphere

A. Choose the correct answer: 1. Which is gas causes the greenhouse effect?    Answer: (b) Carbon dioxide 2. Which is the lowest layer of the atmosphere?  Answer:  (d) Troposphere 3. Radio waves are transmitted back to earth by:                                                                      Answer: (c) Thermosphere 4. Which is is the coldest layer of the atmosphere?                                                     Answer: (c) Mesosphere 5.Continue reading “Atmosphere Lesson -5, Subject – Social Science, Class -VII.”