A Layman’s Cosmology: Speculation on Earth’s Evolution and the Emergence of Humankind

By Henry Christopher

In “A Layman’s Cosmology: Speculation on the Origin of Existence and God,” I speculated “It would appear that Existence might be likened to a vast, endless sea of particles and atoms, with the potential, as Aristotle saw it, to be made into an infinite variety of substances. All that was wanting was a being with the mind to create.” I noted a Creator with a consciousness to love and bring about harmony in creation — modeled after His/Her own being — emerged from this sea of existence.

This article explores the possibilities of how God worked through the evolution of the earth to prepare for the arrival of humankind.

Scientists tell us the universe is 13.8 billion years old, while the earth is 4.5 billion years old. In our reckoning, that is a long period: plenty of time for the Creator to experiment, test, prepare, and develop step-by-step an ideal physical environment and introduce humankind to that world.

According to geological evidence, earth scientists have divided the history of the planet into major eras, periods and epochs in order to track the evolution of earth’s chemical, geological, biological, and climate events. It took four billion years for earth to form out of a volcanic, molten mass, and for life to be introduced.

First, in the Precambrian Era, major developments took place to make the earth capable of supporting life: earth’s molten mass had to cool off and form a solid crust; the chemical composition of the atmosphere had to develop, water introduced, and oceans formed. During the first billion years, a magnetic field formed around the earth, which kept the planet’s atmosphere from dissipating into the vast solar system. Without our atmosphere, life on earth would not exist, as is the case with the Moon and other planets in our solar system.

The evolution of plants, fish and animals started in the sea, where they remained for at least 600 million years. In the absence of a protective ozone layer, the land was bathed in lethal levels of UV radiation. Once photosynthesis raised atmospheric oxygen levels high enough, the ozone layer formed, making it possible for living things to venture onto the land.

The Paleozoic Era or “Age of Fishes” came next, lasting 325 million years, with the introduction of amphibians and insects.

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