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2. When we think about cratering, we usually think of big rocks falling onto a planet, but even
tiny pebbles can make craters. Near the footprint in the above picture, you can see many small
"pock-marks." These marks are the craters made by microscopic particles that hit the surface
moving at speeds of several kilometers per second. Marks like these cannot be found on the
Earth's surface. Why not? List two different reasons. 3. Craters accumulate over time. This
means that the number of craters you see gives a rough idea of the age of the surface. Using this
method, sort the surfaces of Venus, Earth, Mercury, Mars and the Moon by age from oldest
surface via crater counting to youngest. 4. How can you reconcile these vastly different ages of
surfaces with the idea that all the planets formed at the same time? Part 2: Volcanism Around the
Solar System Volcanism can be very important in shaping the surface features of a planet. Venus
has a large number of unique volcanic features. On Earth, when volcanoes erupt, the molten lava
within them can travel great distances before it cools. However, on Venus, molten lava does not
travel very far before it cools. Compare these examples of shield volcanoes on Venus and on
Earth. 5. Volcanoes on Venus and Earth look different. Compare and contrast the pancake
volcanoes with the shield. Give at least two examples. 6. What might cause those differences
between the two planets?

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2- When we think about cratering- we usually think of big rocks fallin.docx

  • 1. 2. When we think about cratering, we usually think of big rocks falling onto a planet, but even tiny pebbles can make craters. Near the footprint in the above picture, you can see many small "pock-marks." These marks are the craters made by microscopic particles that hit the surface moving at speeds of several kilometers per second. Marks like these cannot be found on the Earth's surface. Why not? List two different reasons. 3. Craters accumulate over time. This means that the number of craters you see gives a rough idea of the age of the surface. Using this method, sort the surfaces of Venus, Earth, Mercury, Mars and the Moon by age from oldest surface via crater counting to youngest. 4. How can you reconcile these vastly different ages of surfaces with the idea that all the planets formed at the same time? Part 2: Volcanism Around the Solar System Volcanism can be very important in shaping the surface features of a planet. Venus has a large number of unique volcanic features. On Earth, when volcanoes erupt, the molten lava within them can travel great distances before it cools. However, on Venus, molten lava does not travel very far before it cools. Compare these examples of shield volcanoes on Venus and on Earth. 5. Volcanoes on Venus and Earth look different. Compare and contrast the pancake volcanoes with the shield. Give at least two examples. 6. What might cause those differences between the two planets?