Coldwar on Instagram: "Roll away ball troughs keep livestock water cleaner and warmer outdoors. Animals push the floating ball aside to drink, and once finished, the ball rolls back to seal the opening. The water surface remains covered for most of the day. The covered design reduces contamination from dust, insects, and manure. Open troughs allow debris to enter freely, increasing bacterial growth and algae formation. By limiting exposure, ball trough systems help maintain better water hygiene

3 - Unidirectional bedforms

Transverse and Longitudinal Waves

Storm Harry Effects on Malta's Weather