Sediments are defined as solid fragments of inorganic or organic material. The bulk of sediment is formed from the weathering of rock, wherein the rock is broken into smaller and smaller pieces by a variety of chemical and mechanical processes, including acidic rainfall, freeze/thaw cycles, and the actions of organisms.
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The reddish-orange colour of weathering of volcanic ash is most likely due to its iron sulfide content which oxidizes to iron oxide so that limonite is yellow and hematite is red and in ash since it is such fine grained material it weathers more rapidly because it has a large surface area.
B. Natural selection and Evolution both show the change over time in the survival of a specific organism. Natural Selection chooses traits that correspond the best with the ecosystem, while evolution gradually changes the species as a whole to cope with the surroundings.