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).
This type of natural gravel can be used in the same manner as crushed rock and is most commonly used in the regions where it is produced. Ad. Most other types of landscaping drainage gravel include stones that are either naturally rounded and smooth or manufactured to appear round and smooth.River rock is a popular type of smooth gravel and is usually 1 to 2 inches (approximately 2.5 to 5 cm) in diameter, though it can be found in larger sizes.lmost all types of gravel can be accurately described as loose rock. Some types of landscaping gravel is comprised of smooth round stones, while others are a combination of crushed stone. Gravel can serve a variety of specific purposes, dependent on the size, material type, and the geographic location of the stones.