Assertion: mountain's summit | /r/HasProperty | covered by rock-hard snow
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text: The summit of Everest itself is covered by rock-hard snow surmounted by a layer of softer snow that fluctuates annually by some 5–20 feet (1.5–6 metres); the snow level is highest in September, after the monsoon, and lowest in May after having been depleted by the strong northwesterly winter winds.