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).
The weight of gravel varies depending on the size of the pebbles and the amount of moisture the gravel contains. The typical weight of 1 cubic foot of gravel that is 1/4 inch to 2 inches in size is 105 pounds when dry, and 125 pounds when wet. It is important to know the weight of a cubic yard of gravel if you plan to transport it in your truck.