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"Genesis 1:1–2 states, “In the beginning God created the heavens and the earth. Now the earth was formless and empty, darkness was over the surface of the deep, and the Spirit of God was hovering over the waters.” The gap theory is the view that God created a fully functional earth with all animals, including the dinosaurs and other creatures we know only from the fossil record. Then, the theory goes, something happened to destroy the earth completely—most likely the fall of Satan to earth—so that the planet became without form and void. At this point, God started all over again, recreating the earth in its paradise form as further described in Genesis. The gap theory, which is distinct from theistic evolution and the day-age theory, is also called old-earth creationism, gap creationism, and the ruin-reconstruction theory." from the article: What is the Gap Theory?