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ice subsides Known to us as a glacial period, this is a natural event in the development of the planet. We have to accept the fact that the planet is living entity, and it must evolve just as we must. Since it does not reach for perfection as we do or go through periods of material life and nonmaterial life (sleeping), it has its own way of evolving. This is done through an event called an ice age, or glacial period. This is a natural process, covering entire regions or even the entire planet with ice. Temperatures fall, and changes occur in atmospheric pressure. As a planet ages, the amount of Ice ages occur in rhythmic patterns in accordance with the size and type of planet. The time of an ice age can be determined by simple mathematics. On Earth, this cycle lasts about 700,000 years, which means that every 700,000 years a certain region of Earth will fall into an ice age and cover from 1/6 to 1/4 of the entire surface of the planet. The periods in between are interglacial periods, where from 1/10 to 1/12 of the Earth will be covered. We have had four glacial periods in the last three million years, and we are only 150,000 years away from the next interglacial period and 550,000 years from another great glacial period. All forms of creation go through a process of waking and sleeping. The Earth is no exception. As the Earth has become more evolved, less area of the planet is covered in ice (sleeping) because this would damage some of the other life forms on it. This ice age, or sleeping period, serves as an evolution time for the plants, animals, and humans. This means that a beautiful flower changes into a still more beautiful one. Animals also evolve; for instance, the prehistoric mammoth has become the elephant. The Ozone Problem