31. The line clearly represents a major structural feature of the planet, but its origin is uncertain. 32. This is a structural feature of this industry. 33. The majority of its structural features , including its conformation, detailing and decorative elements, have been unaltered. 34. Each period demonstrated different structural features and alternative pathways for adjustments to internal and external constraints. 35. Digging bars are known by various other names depending on locale, structural features , and intended purpose. 36. Low angle normal faults have been proposed to be a key structural feature for crustal extension. 37. "We don't really understand what structural features produced this giant rise in topography, " says Isacks. 38. The confusion between spinel and taaffeite is understandable as certain structural features are identical in both. 39. Development of the province has in large part been influenced by structural features in its oldest rocks. 40. Seasonally, thick layers of marine growth appear and then disappear on the site, often covering structural features .
