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Created with Fabric.js 1.4.5 The Power and Consequences of Change What Was the "Big Bang?" * 14 billion years ago, the universe was hot, dense and as small as a dot on your paper.* Bang!* Time, space and matter begins! What changes occurred during the formation of the earth? The universe continued to expand. Our brightest star, the sun heated up and particles of dust, gasses and early forms of matter gathered around it, sometimes bumping into each other to form larger masses. What changes occurred during the Precambrian Period? The Precambrian time is important because:*It contains 90% of Earths geologic history and climate changes.*The formation of the solar system.*Physical systems (atmosphere, lithosphere) took shape.*Early life forms (Eukaryotes, or organisms with DNA) appeared*Bombardment of asteroids and comets. *The formation of the moon.*Early signs of photosynthesis.*Plate tectonics. The Precambrian time is important because:*It contains 90% of Earths geologic history and climate changes.*The formation of the solar system.*Physical systems (atmosphere, lithosphere) took shape.*Early life forms (Eukaryotes, or organisms with DNA) appeared*Bombardment of asteroids and comets. *The formation of the moon.*Early signs of photosynthesis.*Plate tectonics. How can we identify and describe the earth's physical systems? double click to changethis text! Drag a cornerto scale proportionally. As the earth was forming and "degassing" itself about 500 million years ago, early signs of a dense atmosphere emerged. Through volcanism and the movement of the plates, the lithosphere formed. The early temperatures of earth's crust was thought to be about 600 degrees C. Through constant chemical changes accumulating in the atmosphere and lots of condensation, the hydrosphere was formed resulting in oceans of water in which sedimentation occurred.The biosphere's first life forms began with prokaryotes, which were single celled bacteria and archaea that lived in the ocean without the need of oxygen. Thus, the primary systems of the earth are: Atmosphere, Lithosphere, Biosphere, Hydrosphere. Some scientists include the Cryosphere. How do the earth's physical systems and processesinfluence and change the earth? Cause and Effect Changes Occur*Plate Tectonics (Pangea)*Volcanoes*Earthquakes*Erosion and Weathering*Glacier Movement How can our past help us predict the future? We have chosen to bring future generations into this world of rising seas and warming temperatures, droughts and floods, heat waves and wildfires, a world in which one in four mammals and one in eight birds are at risk of disappearing forever. While the damage we've done is irreversible, that doesn't give us the right to do nothing.Leonor Varela We know from the past that climate is a great indicator of change. As a result of global warming, climate change, and human development, ecosystems will change. Paying attention to data, tracking models, warning systems and creating a culture of responsible global citizenship, we can look forward to the future with hope and optimism.
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