Because they need their swimming pools in California.
No. Drinking water is always a minority use in terms of volume. California water is mainly used for crops and livestock, for cleaning and for swimming pools.
Swimming has been held at every Olympic games since 1896. Open water swimming was added in the 2008 Olympics.
While submerged in water? ie. Swimming outside Yes because while you are swimming you are still receiving some of the sun's rays, they should change.
swimming has appeared at every modern Olympics, which started in 1896. Womens swimming was introduced to the Olympics in 1912.
swimming is the only real sport that takes place in the water. You are also using every single muscle in your body.
No. You do not have to change their water everyday. But every other day is good.
If there is something so wrong with it that you can not correct it.
Every 2-3 days change the water entirely
Every month.
There are many ways in which water is wasted every year. This includes taking long showers, filling swimming pools, and leaving the faucet running while brushing teeth.
Every thing exists under the same laws of Gravity. many things seem lighter in a swimming pool because they are relatively lighter in a heavy medium like water rather the light medium like air. Nearly every thing falls to the ground in air. however there are a lot of things that float or go up in water because they are lighter then water. this rule applies to every thing even things that sink.