Sedimentary rocks usually form from the deposition of material at the surface of the earth and under water. Sedimentation is a process that causes the minerals to settle and accumulate from the solution. Particles that forms sedimentary rock by accumulation is called sediment. Sediment was formed by weathering and erosion which is then transported to the place of deposition by ice, mass, wind, water, or glaciers. Sedimentary rocks contains information regarding the history of the Earth. It may be fossils, the remains of ancient plants and animals.
High-impact journals are those considered to be highly influential in their respective fields. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.
Last date updated on June, 2014