| 1 | "Material, such as gravel or slag, from which metal is extracted in mining. " | |
| 2 | We walk on and on in the dark over the loose gravel. | |
| 3 | The sudden arrest of his motion, the abrasion of one of his hands on the gravel, restored him, and he wept with delight. | |
| 4 | But the oil is viscous and awash in sand and other impurities. | |
| 5 | People would pick up handfuls of gravel from the bottom of the streams and sort out the diamonds. |