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).
Best Answer: Bulk density of gravel depends on particle size; composition, moisture content and particle shape. But for clean quartz gravel about 25mm in diameter, the figure would be about 1.6 tonnes per cubic metre (for washed fine sand, it would be about 1.5 tonnnes in bulk).est Answer: Bulk density of gravel depends on particle size; composition, moisture content and particle shape. But for clean quartz gravel about 25mm in diameter, the figure would be about 1.6 tonnes per cubic metre (for washed fine sand, it would be about 1.5 tonnnes in bulk).