1. Larger tubes produced larger diameter rock cores and require more drill power to drive them. 2. The drilling of rock cores may unlock clues about the Earth's past and future climate. 3. The rock core itself contained several rock-cut tombs dating back to the 5th and 6th dynasty. 4. Each rover would place rock cores in canisters that the rocket would shoot into low orbit. 5. These tools included blades, scrapers, a projectile point, and a large rock core from which flakes were struck. 6. Starting in the mid-1980s, Hong Kong Geotechnical Engineering Office used the remaining bunkers to store rock core samples. 7. The mission will take Martian surface samples and rock cores for potential return to Earth by a later mission. 8. Although Penfield had plenty of geophysical data sets, he had no rock cores or other physical evidence of an impact. 9. One way to achieve the first goal is to use a rock coring drill that has a pipe tipped with diamond bits. 10. The choice of tube size is a trade-off between the rock core diameter desired and the depth that can be drilled with a particular drilling rig motor.
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