A sedimentary rock is formed by bits of mountain rocks falling by piece by piece. The rocks fall in flowing river down from the mountain these littler bits of rock & sand are called sediments. When the water slows down enough, these sediments settle in the lake or the ocean they run into. Sedimentary rocks most often have fossil stuck in them. Most of the fossils are found as plants, animals, or even marshes. FOR MORE INFORMATOIN GO TO THIS SITE......http://www.MarsMania.yolasite.com
how to identify sedimentary, igneous and metamorphic rocks • When it comes to the three rock types, it's all in the name. The names themselves - igneous, sedimentary and metamorphic - are descriptions of how the rocks formed. Understanding how the rocks physically or chemically formed can be the first step in being able to identify rocks in the field. It also helps to have the right equipment. Geologists commonly use rock hammers and rock lenses, or small magnifying glasses, to aid in the identification of rocks and rock minerals; but the most important tool is a good eye.
Physical weathering Physical weathering is the only process that causes the disintegration of rocks without chemically changing it. The primary process in physical weathering is abrasion (the process by which clasts and other particles are reduced in size). However, chemical and physical weathering often go hand in hand. For example, cracks exploited by physical weathering will increase the surface area exposed to chemical action. Furthermore, the chemical action at minerals in cracks can aid the disintegration process.
Why scientist are wasting money on mars ? • The first Earth-like planet orbiting a distant star could be discovered within four years, astronomers believe. None of the 300 "extra-solar" planets so far identified beyond our own system is thought to be suitable for life, so the discovery of an Earth-like planet made of rock rather than hot gas or frozen ice would significantly increase the chances of finding the second habitable world, scientists said.