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We are relatively "new" to the Earth yet how come our impact to the Earth System has been profound?
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- How do scientists really know how old the planet is?What was the composition of the earth’s atmosphere at the time of the origin of life, and how did it differ from the atmosphere of today?What evidence would you look for on one of these moons that would tell you that life may have existed on it in the past?
- When scientists try to assess the habitability of Mars, what is their guiding principle, based on what we know of life on Earth?what can you say about the story of earth?If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is _______ years old. a. 15,000 b. 26,667 c. 30,000 d. 40,000
- Why does there appear to have been only one origin of life on earth? Why are there not multiple origins? Why is life not originating still?For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?Why do you think eruptions of volcanoes like Mt. Pinatubo might have a cooling effect on the Earth’s surface?
- What are stromatolites? From what we know of their formation today, why might we expect them to have been present early in Earth’s history?south america and africa are drifting apart. where might they be couple hundred years ago?If the earth migrated backward to three times it's current distance away from the sun, by how much would the suns gravitational force on us weaken?
