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Assemblée ont un état énergétique plus stable que sous forme de monomères

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If Venus and Earth outgassed a similar amount of CO2 early in their histories, why are their surface temperatures so different today?a. Venus didn't have a detectable magnetic field, so the solar wind reached Venus's surface and evaporated additional CO2 from the crust, increasing the greenhouse effect and making its surface much hotter.b. Venus was closer to the Sun, water tended to be in the atmosphere rather than in oceans, and CO2 couldn't be dissolved. Therefore, the runaway greenhouse effect made the surface of Venus much hotter.c. Venus didn't contain any water, so CO2 couldn't be dissolved and converted into sediments. Therefore, the runaway greenhouse effect made its surface much hotter.d. Venus's moon fell onto the planet with a catastrophic impact, producing massive ejecta and increasing the abundance CO2 of in the atmosphere. Therefore, the greenhouse effect made its surface much hotter.

Why do the belts and zones on Saturn look so much fainter than the ones on Jupiter?a. Clouds on Saturn have different chemical compositions than those on Jupiter. Saturn's clouds absorb much more light than they reflect and emit.b. Unlike on Jupiter, belts and zones on Saturn have similar chemical composition. That's why they are difficult to distinguish.c. Saturn is much colder and the cloud layers where belts and zones form are deeper in the atmosphere.d. Saturn is much hotter but the cloud layers where belts and zones form are cold and they sink deep into the atmosphere.

The Cassini spacecraft recorded the image below of Saturn's A ring and the Encke Gap. What do you see in this photo that tells you about processes that confine and shape planetary rings?a. There are dark and white lines in the rings. Dark lines are formed by Saturn's magnetic field; white lines are formed by the magnetic field of Titan.b. There is a wide gap and multiple ringlets in the picture. The gap occurred due to Saturn's interaction with Jupiter; the ringlets occurred due to its interaction with moons.c. There is a wide gap and multiple ringlets in the picture. The gap is shaped by resonance with satellites outside the rings; the ringlets are caused by shepherd satellites.d. There are dark and white lines in the rings. White lines are formed from ice particles of Saturn's moons; dark lines are formed from rocky particles of Saturn.

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