Relative dating to determine the age of rocks and fossils. Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth's surface to determine the relative ages of geological events preserved in the rock record.
In contrast, fibers from natural sources are provided by nature in ready-made form. Natural fibers include the protein fibers such as wool and silk, the cellulose fibers such as cotton and linen, and the mineral fiber asbestos. Plant fibers can be further on classified as:1  Fibre occurring on the seed (raw cotton, java cotton). 2  Phloem fiber (flax, ramie, hemp, jute).n contrast, fibers from natural sources are provided by nature in ready-made form. Natural fibers include the protein fibers such as wool and silk, the cellulose fibers such as cotton and linen, and the mineral fiber asbestos. Plant fibers can be further on classified as:
Primary Purpose of Insoluble Fiber. Cellulose is considered insoluble because it does not bind with water nor change form in the digestive tract. Another type of fiber, called soluble fiber, does bind with water and become a gel-like substance -- that type of fiber serves different purposes in your body. Because insoluble fiber travels through your digestive system unchanged, it helps move waste through your digestive tract, which prevents constipation.