Types of gravel include: 1  Bank gravel: naturally deposited gravel intermixed with sand or clay found in and next to rivers and streams. 2  Bench gravel: a bed of gravel located on the side of a valley above the present stream bottom, indicating the former location of the stream bed when it was at a higher level.
1 is the sixth part of 6. 2 is two sixths, and also the third part, of 6. 3 is three sixths, and also half of 6. 4 is four sixths, and also two thirds, of 6. is the sixth part of 6. 2 is two sixths, and also the third part, of 6. 3 is three sixths, and also half of 6. 4 is four sixths, and also two thirds, of 6.
The frequencies of notes that are a 'perfect' fifth apart are in the ratio of 1.5, exactly. G is seven chromatic steps above C, so, using the 12th root of 2, the ratio between G and C on either standard scale is (12th root of 2)^7 = 1.49830707688, which is slightly less than the 1.5 required for a perfect fifth.