Can water evaporate at room temperature?

I poured water into a cup and drew a line at where I first initially poured it. It’s been 3 days and the water has gone down about 2-3cm below the line. I have not exposed the water in the cup to sunlight, nor has anyone or anything touched the cup. It is isolated by itself and the water is going down. Any theories... show more I poured water into a cup and drew a line at where I first initially poured it. It’s been 3 days and the water has gone down about 2-3cm below the line. I have not exposed the water in the cup to sunlight, nor has anyone or anything touched the cup. It is isolated by itself and the water is going down. Any theories as to why this may be? I thought water evaporated at 212°, not at room temperature. Thanks in advance!
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