Wind/Kite Surfing at Sunset

I cane across these boys out at Chesterman’s Beach at sunset. As you can tell,the wind was up and everybody was taking advantage of it.
The wind comes from the sun,or because of it more accurately. The sun heats up the surface of the earth and the air becomes lighter and rises. Much the same way a Lava lamp works. We’ve all seen those hypnotic little throw backs from the 60’s!
Anyways,these air currents are happening everywhere and start to push the air around stronger and stronger,until they make become a measurable force. Lots of heat will produce lots of wind.