खालील विधाने पहा :
(a) वातावरणाच्या सर्वात खालच्या थराला तपांबर म्हणतात.
(b) सर्व हवा हवामानातील घटना (उदा. ढग, धुके, वृष्टी, वादळ इ.) ह्या थरात आढळतात.

The correct answer is Option C (Both are correct).

Key Points:
• Atmospheric Layering - Troposphere (तपांबर):
• Statement (a) is CORRECT: The troposphere is the lowermost and densest layer of the Earth's atmosphere, containing roughly 75% of atmospheric mass and 99% of total water vapour and aerosols. Its average altitude is 13 km (extending up to 8 km at the poles and 18 km at the equator).
• Statement (b) is CORRECT: Because virtually all water vapour, dust particles, and strong convectional air currents are concentrated here, all major meteorological and weather phenomena—including cloud formation, rain/precipitation, fog, cyclones, thunder, and storms—occur exclusively within the troposphere.
• Temperature in this layer decreases with height at the Normal Lapse Rate of 6.5°C per 1,000 meters (165 m / 1^°C).
• Hence, both statements are correct (Option 3).
• Key Takeaway: The troposphere is the lowest atmospheric layer where all weather phenomena (clouds, storms, rain) take place.