# Landform Mapping: The Terrestrial Planets Instructor Notes

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1 Exercise Two is suggested as an introductory exercise. 1.5 hours Exercise Ten Landform Mapping: The Terrestrial Planets Instructor Notes Suggested Correlation of Topics Planetary comparisons, geomorphology Purpose The objective of this exercise is to recognize and compare the similarities and differences among the surfaces of the terrestrial planets at a global scale. Materials Suggested: clear acetate or overhead transparency film, overhead projector markers, metric ruler, drawing compass (a single compass can be used by a group of students). Substitutions: tracing paper, colored pens or pencils, pen and string (as a compass). Background This exercise views Mercury, Venus, Earth, Moon, and Mars at the global scale. At this scale only the largest and most prominent landforms and terrains are visible. This provides a starting point for more detailed study of planetary surfaces in later exercises or as provided by the instructor. Note that the Moon, although not actually a planet, is typically grouped with the terrestrial planets when considering its geology. This exercise is best worked in pairs or small groups of students. When the students are working on question 16, encourage them to compare the images side by side in ordering the surfaces from least to most complex. The starred question can be used for more advanced students or for class discussion. Science Standards Earth and Space Science Origin and evolution of the Earth system Mathematics Standards Connections Number and number relationships 115

2 1. The highlands are bright, rugged and heavily cratered. The plains are dark, flat, smooth and less cratered. Answer Key by volcanic material; no linear mountain chains on the Moon; no prominent arcuate ridges or trenches on the Moon. 2. The highlands. 3. The highlands. 4. Younger. 5. Cratered plains and rayed craters. 6. Older than the lunar plains. (Lunar plains are often called maria.) 7. All three surfaces have craters, although Mars has the least. Mars has more extensive smooth plains than the Moon or Mercury; no obvious volcanoes or canyons are visible on either Mercury or the Moon. Only Mars shows polar ice caps. 8. Mars has a dynamic atmosphere (including dust storms). Gradation by running water occurred on Mars, but water never flowed on the Moon. Volcanic activity has been more extensive on Mars. Tectonism has occurred on Mars. On the Moon, impact cratering and plains volcanism have been the major geologic processes; on Mars, all four major geologic processes have worked to shape the surface. 9. Younger. 10. The southern region is older. 11. Mars. 12. a. Both are long and relatively narrow. The canyon on Mars is straight, the one on Venus is arcuate. [If the student says the Venus canyon is bright and the Mars canyon is dark, remind them of the differences in imaging systems: radar vs. optical camera.] 13. Younger. 14. a. Smooth plains, canyons (deep ocean trenches and rifts in Africa), volcanoes (represented by islands) and rough ÒhighlandsÓ (mountain ranges). b. Continents, mid-ocean rift/ridge zones. 15. a. Similarities: if EarthÕs continents are thought of as Òhighlands,Ó both can be divided into highð and low-standing regions; low-lying regions are relatively smooth. Differences: the Moon is dominated by craters; lowlands on the Moon are formed by large impacts flooded b. Students will have difficulty finding any similarities between Earth and Mercury. Differences: Mercury is dominated by craters (impact cratering is the prominent geologic process); on this image of the Earth, impact cratering is the only geologic process that is not apparent. c. Similarities: both have volcanic and tectonic landforms. Differences: no continents or midocean ridge system on Mars, no craters seen on this global view of Earth. d. Similarities: both show arcuate mountain ranges; both show expansive smooth regions; neither shows very large craters. Differences: more extreme topography on Earth, continents and deep ocean basins, compared to more uniform topographic level on Venus; no midocean ridge systems on Venus. 16. a. Oldest to youngest: Mercury, Moon, Mars, Venus, Earth. b. Answers will vary based on students perception of Òmost complex.ó Earth has the most active geologic history reflected on its surface, however, some students may argue that Venus is more complex. Least to most complex: Mercury, the Moon, Mars, Venus, Earth. 17. (This representation is ~1/3 the size of what student answer should be.) Moon Mercury Mars Venus Earth *18. Answers may vary. In general it is true that the larger the terrestrial planet, the more complex its surface. This is not strictly true, however: the Moon, despite its smaller size, is arguably more complex than Mercury. Students might wish to debate the relative complexity of Earth and Venus, or Venus and Mars, as seen at the global scale. 116

3 Name Exercise Ten Landform Mapping: The Terrestrial Planets Purpose To examine and compare global-scale surfaces of the terrestrial planets. Materials Clear acetate, overhead projector markers, metric ruler, compass. Introduction At a global scale, only the largest planetary landforms and regions are visible and can be identified. Such landforms include large volcanoes, canyons, impact craters, plains regions, mountains, and highlands (topographically Òhigh standingó regions). Although the Moon and planets formed at the same time (about 4.5 billion years ago) their surfaces differ in age. This difference is due to variation in the levels of geologic activity on each body since their formation. The four main geologic processes (volcanism, tectonism, gradation, and impact cratering) have worked to alter the original surfaces. In comparing planetary surfaces, relative ages are usually determined from impact craters. In general, older surfaces show more craters, larger craters, and more degraded craters than younger surfaces. Questions Moon Examine Figure Place a piece of clear acetate over the photo. Trace the outline of the Moon. Divide the Moon by its two major regionsñhighlands (light) and plains (dark)ñby outlining the light-toned and dark-toned areas. On the Moon, the plains are called ÒmariaÓ (which means ÒseasÓ in Latin) for their fanciful resemblance to oceans. 1. Describe the characteristics of each region. 2. Which of the two regions appears to be most heavily cratered? 3. Which region on the Moon is olderñthe plains or the highlands? 4. Some large, young craters have bright ejecta deposits that form a star-like pattern of rays around them. Trace two such craters and their deposits onto your acetate map. Are these craters older or younger than the plains? Mercury 5. Examine Figure What landforms and regions do you observe on Mercury? 117

4 6. Based on the number of craters, do you think the surface of Mercury is older, younger, or about the same age as the plains on the Moon? Mars Examine Figure Mars has a thin atmosphere, seasonal dust storms and polar ice caps (notice the bright south polar ice cap near the bottom of the figure). At one time, Mars had liquid water on its surface, although today Mars is too cold to have liquid water and only has ice. The darker spots within the bright region of the upper left of the image (marked AÐD) are large volcanoes. Images sent back from surface landers and other remotely acquired data show that the lighter toned areas are relatively dusty and the darker toned areas are sandy or bare rock. Near the center of the image is Valles Marineris (marked E), a large canyon system of probable tectonic origin. 7. List similarities and differences in the features found on Mars compared to those on the Moon and Mercury. 8. Why is the surface of Mars different from the Moon? (List reasons that support your answer.) 9. Based on the number of impact craters, do you think the surface of Mars seen here is older, younger, or about the same age as the highlands on the Moon? 10. Based on the number of impact craters, which part of Mars is older, the northern or the southern region? Venus Although the atmosphere of Mars is relatively cloud free, the thick cloud cover on Venus completely hides the surface from viewing by cameras. Using radar, which can penetrate through clouds, the Magellan spacecraft sent back radar images of the surface of Venus. In general, these radar images show rough topography (such as mountains, rift zones, crater rims and ejecta) as bright, and smoother material (plains) as dark. A volcano (A), a crater (B), and a canyon (C) have been labeled on the image. 11. Which planet looks more like Venus at the global scale: Mercury or Mars? 12. Compare Valles Marineris on Mars to Artemis Corona (the canyon marked C) on Venus. How are their morphologies the same? How are they different? 13. Based on the number of craters, do you think the surface of Venus is older, younger, or about the same age as the highlands on the Moon? Earth Figure 10.5 shows a digital representation of the Earth, shown as it might look from space if it had no clouds and no oceans. In this way, EarthÕs landforms can be compared to those of other planets. 14. a. List some major landforms on Earth that are comparable to what you have seen on the other planets. b. List some different types of landforms you can see. 118

5 15. List some similarities and differences between the landforms of the Earth and: a. Moon b. Mercury c. Mars d. Venus 16. Based on the number of craters, the number of geologic processes evident and the different types of landforms seen on the images, list the five surfaces you have examined in order : a. From oldest to youngest. b. From least complex to most complex. 17. Examine the table on the next page. Using a compass, draw circles showing the relative sizes of Mercury, Venus, Mars, the Moon, and Earth in the sketch area below. Let the diameter of Earth equal 6 cm. Sketch area 119

6 Mean Distance from Sun (millions of km) Equatorial Diameter (km) Equatorial Diameter (Earth diameters) Mass (relative to Earth) Volume (relative to Earth) Mercury Venus Earth Moon Mars ,400 km from Earth ,104 12, Density (g/cm 3 ) *18. Before the initial reconnaissance of the solar system by spacecraft was completed, it was traditionally believed that the geological complexity of surface features on a solar system body would be related to the size of the body, larger planets being more geologically complex. Is this true of the terrestrial planets? Support your answer. 120

7 Figure Photograph of the Moon. North is to the top. (Courtesy of Ewen A. Whitaker, University of Arizona.) 121

8 Figure Mariner 10 mosaic of Mercury. North is to the top. (NASA P ) 122

9 A B C D E Figure Viking Orbiter global mosaic of Mars, centered at -30, 90. North is to the top. (Courtesy U.S. Geological Survey, Flagstaff, Arizona.) 123

10 A B C Figure Magellan radar mosaic of Venus. North is to the top. The smooth gray and black sections at the bottom of the figure are portions of the south pole that were not imaged by the spacecraft. (NASA P ) 124

11 Figure Global representation of the Earth in which higher standing topography is shown as brighter, centered at 0, 50. North is to the top. (Courtesy U.S. Geological Survey, Flagstaff, Arizona.) 125

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