Most sedimentary rocks contain internal layering called bedding or stratification. Stratification may range from a bed thickness of many meters down to fine millimeter-size laminations.  As sedimentation continues, the earlier deposited sediments are laden with an increasing overburden. They are compacted, reducing the available pore space and expelling much of the pore-water. Calcite (calcium carbonate), silica, and hematite (red iron oxide) are the most common cementing agents. You may be familiar with calcite (or lime) encrustation on old plumbing fixtures, showerheads, and inside hot water heaters. As the process of weathering proceeds the products are carried off. The most important transporting agent is water. Water carries or rolls particles in rivers, from the smallest suspended clay particles to the largest boulders. Boulders and smaller rock fragments continue to be broken up and chemically altered as they tumble downstream. Water also carries dissolved minerals, such as silica and cations downstream as well as in the groundwater. This information can be published in our peer reviewed journal with impact factors and are calculated using citations not only from research articles but also review articles (which tend to receive more citations), editorials, letters, meeting abstracts, short communications, and case reports. The inclusion of these publications provides the opportunity for editors and publishers to manipulate the ratio used to calculate the impact factor and try to increase their number rapidly. Impact factor plays a major role for the particular journal. Journal with higher impact factor is considered to be more important than other ones