r2–d2: Ball’s Pyramid, an erosional remnant of a shield volcano and caldera that formed about 7 million years ago. Ball’s Pyramid is 20 km. southeast of Lord Howe Island at Australia in the Pacific Ocean. Photo by Hatty Gottschalk
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r2–d2: Ball’s Pyramid, an erosional remnant of a shield volcano and caldera that formed about 7 million years ago. Ball’s Pyramid is 20 km. southeast of Lord Howe Island at Australia in the Pacific Ocean. Photo by Hatty Gottschalk
