Tasha went on a trekking expedition to a mountain range during her vacation. When she reached a particular height, it started raining heavily. Which sphere of Earth is responsible for this sudden weather change?

The sudden change in climate is as a result of the interaction of the atmosphere and the lithosphere. The heavy rains at high altitude are as a result of relief rainfall. The mountain acts as a barrier, causing the air to rise. Once air rises it cools and condenses. Cloud formation often leads to precipitation on the windward side of the mountain.