| 1 | It provides access to a large-cross section of a well, instead of just a narrow, vertical shaft. | |
| 2 | A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis. | |
| 3 | Two men stand near a section of the collapsed sea wall, right, in Minamisanriku, northeastern Japan. | |
| 4 | The hairs themselves were strangely shaped: the cross-sections were triangular, grooved, or shaped like kidneys instead of circular. | |
| 5 | The other three sections, 'minerals', 'technology', and 'micro-organisms' delve deeper into the tiny world existing under our noses. |
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