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The orographic effect, a modern scientific concept, explains how mountains influence precipitation. When moist air encounters elevated terrain, it is forced upwards, cooling and condensing to form clouds. This process often leads to precipitation on the windward side of the mountain. Conversely, the leeward side may experience arid conditions due to descending, dry air. Higher altitudes, therefore, receive more rain due to this phenomenon.
Cloud Formation and Precipitation: As air ascends mountainous slopes, the cooling temperature condenses water vapor, leading to rainfall or snow on the windward side. Dew and Dry Conditions: If no significant rain falls, moisture can still condense as dew at night on cooler, elevated surfaces.
The Quran in 2:265 states:
And the example of those who donate their wealth, seeking Allah’s pleasure and believing the reward is certain, is that of a garden on a fertile hill: when heavy rain falls, it yields up twice its normal produce. If no heavy rain falls, a drizzle is sufficient. And Allah is All-Seeing of what you do.2:265
Here, "Rabua" (high ground) is associated with increased rain and dew, aligning with the orographic effect.
- High Rainfall: The verse acknowledges heavy rain benefiting highlands, much like the precipitation caused by the orographic effect. - Dew Formation: Even in the absence of rain, dew nourishes the elevated terrain, paralleling scientific observations. The verse remarkably captures a relationship between elevation and precipitation that aligns with modern meteorological principles. Whilst these verses might not necessarily reference the scientific findings mentioned here, they showcase how, even the most hard to imagine realities explained by the Quran, can be shown to be permissible with modern scientific discoveries.