Physics 121 Quiz 8 Questions and Answers

Physics 121 Quiz 8 Questions and Answers The polar caps on Mars contain both frozen water and frozen carbon dioxide ice. - Answer-True Evidence shows that Mars was likely colder and drier in the past. - Answer-False The planet that can be most easily seen going through phases from earth is: - Answer-Venus How many Earth days do Venus's clouds take to circle the planet once? - Answer-impossible to tell; they vary in speed The two inner planets that probably (one definitely does) have active volcanism are - Answer-Venus & Earth Which of the inner planets have moons? - Answer-Earth & Mars The Sun has the same diameter as ___ Earths stacked one on top of the other. - Answer-109 Which inner planet resurfaces itself every few hundred million years? - Answer-Venus Appears bright to the naked eye. Goes through phases like the moon. Surface is shrouded by dense cloud. - Answer-Venus Appears red to the naked eye. Thought to foster intelligent life due to the appearance of canals on its surface. - Answer-Mars The only planet completely within the "Goldilocks" zone. - Answer-Earth High internal density. Composed of many heavier materials, such as metals. Has the smallest orbit period around the Sun. - Answer-Mercury Earth's atmosphere is made of many different gases. The most abundant gas is - Answer-Nitrogen The most abundant molecule in Venus' atmosphere is - Answer-Carbon Dioxide Due to the Earth's outer liquid metallic core spinning around an inner solid core, there is a ___ field which protects us from harmful radiation. - Answer-magnetic Mercury has the biggest difference between daytime and nighttime temperatures of any inner planet. - Answer-True Venus's temperature is more or less constant everywhere on the planet. - Answer-True If Earth's axis were tilted more than it is, we would have ___ seasons. - Answer-More extreme The most likely explanation for the Moon's existence is - Answer-the Moon was formed when a Mars-sized body struck the young Earth.