ANSWER: Correct Chapter 1 Question 7 Â­ True/False Part A A scientific theory is a tentative or untested explanation that is proposed to explain scientific observations. This preview has intentionally blurred sections.
Gravel /ËÉ¡rÃ¦vÉl/ is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. In the Udden-Wentworth scale gravel is categorized into granular gravel (2 to 4 mm or 0.079 to 0.157 in) and pebble gravel (4 to 64 mm or 0.2 to 2.5 in).
However, the specific density of gravel will always be greater than that of water (1.0) and less than that of concrete (2.4). A regular gravel could have a specific density of say 1.8. The density of water is 0.254 ton / cu. yd so 1 cu yd. of gravel could be 0.254 x 1.8 = 0.457 ton.