A greenhouse effect that keeps getting stronger until

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3. a greenhouse effect that keeps getting stronger until all of a planet's greenhouse gases are in its atmosphere This is presumably what happened on Venus. What is the importance of the carbon dioxide (CO 2 ) cycle? 1. It allows for an ultraviolet-absorbing stratosphere. 2. It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate. 3. It will prevent us from suffering any consequences from global warming. 4. It makes the growth of continents possible. 2. It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate. But remember that this natural cycle operates over time scales of hundreds of thousands of years, and hence cannot help us with the problem of human- induced global warming. Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial planet's geological destiny? 1. whether or not it has liquid water 2. its size 3. its composition 4. its distance from the Sun 2. its size
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Size determines how long a planet can retain internal heat, which drives geological activity Which of these processes could not exist if Earth did not have a magnetic field? 1. Aurora Borealis 2. The Himalayas 3. Volcanoes 4. The Grand Canyon 1. Aurora Borealis This event is caused by particles trapped in Earth's magnetic field. Which one of these features is being shaped primarily by the process we call tectonics? 1. Aurora Borealis 2. The Himalayas 3. Volcanoes 4. The Grand Canyon 2. The Himalayas What is the Lunar Maria? The areas on the moons surface that are smooth and dark The Valles Marineris the system of canyons on Mars was formed by what geologic process? 1. Volcanism 2. Impact Cratering 3. Erosion 4. Tectonics 4. Tectonics Which of these planets has an extremely low atmospheric density? 1. Venus 2. Earth
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3. Mars 3. Mars Venus's atmosphere is so dense we cannot see the surface. And Earth's is in the middle. So Mars must be too thin.
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