11. They were able to study the area at different depths, especially earthquakes that had occurred at those depths. 12. To teach himself how, he photographed a white cup and saucer a thousand times, against backgrounds of different tonal depths, making notes on each exposure. 13. In the next canyon, a different depth delivers a shade of brilliant blue. 14. The defused mines are buried at different depths, in either dirt or sand, to test different conditions. |