Evolution Quote by Richard M. Ketchum

““To understand how the first tree appeared on Earth, we must look back more than 3 billion years to Earth’s cooling off and changing from a molten sphere to one that had a solid crust. As it cooled, a thin layer of granite formed over the fiery interior; the hot inner mass contracted; ridges were thrust upward to form mountains; molten lava surged up through cracks, and boiling water rose to the surface. As hot springs that even now gush up out of the Earth show, this process is still going on; geysers and active volcanoes testify to the searing heat that prevails far inside the earth. Scientists believe the water in our oceans today was first released by volcanic action as a gas, which formed the primeval atmosphere. When this vapor reached extremely high altitudes, it condensed into water and fell Earthward. For a long time, however, because the atmospheric temperature was so hot, it resumed its gaseous form before reaching the planet, but eventually, the surface cooled enough so that water began accumulating in liquid form. And then, for literally millions and millions of years, it must have rained continuously, the water sweeping minerals down from the rocks and filling the depressions in the Earth’s face. For””

— Richard M. Ketchum