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How is that possible? Because hot deserts have almost no cloud cover. Cloud acts like a blanket — it traps the sun's heat during the day and prevents it from escaping at night. Without clouds, the desert absorbs intense solar radiation during daylight and then bleeds every joule of that heat back into space as soon as the sun sets. The result is the highest diurnal temperature range on Earth — the difference between a day's highest and lowest temperature. In the Sahara, this can exceed 50°C. Understanding that single fact unlocks almost everything else about how desert life works, why plants and animals look the way they do, and why living here is such a challenge.
But here is the other thing that surprises people: the Thar Desert, straddling the India–Pakistan border, is home to roughly 83 million people. This is not an empty wasteland. It is one of the most densely populated deserts on Earth, full of cities, traditions, solar farms, and the constant tension between opportunity and fragility.
Figure 1: Key features of a hot desert: sand dunes, rocky plateau, wadi, oasis and a drought-adapted plant.
A wadi is a river valley that is dry for most of the year and fills only after rare heavy rain.
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