Can't see any choices but isn't it something to do with different air masses "meeting" each other such as hot air and cold air, with maybe a spot of water vapour and a few winds thrown in for good stormy weather ?
Answer: Magnesium
Explanation: Magnesium is the only option with an ionic radius smaller than that of Calcium.
Answer:
Physical education provides cognitive content and instruction designed to develop motor skills, knowledge, and behaviors for physical activity and physical fitness. Supporting schools to establish physical education daily can provide students with the ability and confidence to be physically active for a lifetime.
