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761 ~11 d. Larger sizes (of the same density material) produce larger craters. Mass (density) is the controlling factor. Size (radius) is not a factor in the equation for kinetic energy. 5 52 Activities in Planetary Geology for the Physical and Earth Sciences b. Higher velocities produce larger craters. InstructorÕs note: Impacting objects in space have different densities. For example, meteorites occur as high density objects (iron meteorites) or as lower density objects (stony meteorites). Comets are composed mostly of water ice and have relatively low density.

If the availability of images or stereoscopes is limited, then students might move among work stations prearranged by the instructor. Materials When first trying to view stereo photographs, some students may become frustrated. Encouragement and patience are important in getting this exercise started. It is helpful to have the students place their index fingers on the same object within each photo of the stereo pair and then adjust the position of the stereoscope until their fingers appear to overlap.

A. All three craters contain similar parts: crater, rim, ejecta. b. Answers will vary, but many students will note that the explosive and volcanic craters are not as symmetrical as the impact craters. The volcanic eruption crater will be the most irregular. a. Ejecta from the vertical impact are thrown out at about a 45¡ angle. The sheet of ejecta moves outward in a symmetrical pattern, producing the appearance of an enlarging, inverted cone. For the 45¡ impact, the ejecta cone becomes asymmetrical and distorted in the down-range direction.

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