what is the basis on which the earth is divide into concetric level.Give reason ? don't to irrelevant answers otherwise reported
Answers
Explanation:
swimming pool is a tank or large basin that is filled with water and intended for recreational or competitive swimming or diving. Pools are also used for other bathing activities, such as playing, wading, water exercising, floating on inner tubes, or cooling off on hot days.
An outdoor swimming pool
Various methods are used to keep algae, germs, and other bad things out of the pool. The chemical chlorine kills germs and algae. Sometimes sea water is also used for this. The filtration system is also used for this. Pump and Filter are two main components of a swimming pool filtration system.
Types of pools Edit
Some pools are indoor so they can be used when weather is bad. Most are outdoor. There are different types of swimming pools.
The competition pool. Swimming competitions can be held there. Competition pools are usually very large, and usually either 25 or 50 m long and their deep end is 2 to 5 m deep. They have usually 4 to 8 lanes.
A play pool is made for children, and quite shallow, typically no deeper than five feet (1.5m). Play pools can have a decorative shape.
A freeform pool is built generally to imitate a natural lagoon pool or small oasis. It will have a natural uneven shape, and will often have features around it like rocks and waterfalls to compliment the naturalistic style.