All about Earth Sciences.
Sedimentary Rocks The upper 16 km thick earth’s crust contains only 5% of the sedimentary rocks, while the percentage of the sedimentary rock in the exposed rocks is about 75%. These rocks are found chiefly as an extensive cover over the continental crust. In the subject of rock formation, sedimentary rocks and their formation is …
Rocks: A major part of the earth’s crust is composed of rocks. Rocks may be defined as an aggregate of minerals. Some rocks, such as quartzite (quartz) and marble (calcite), contain grains of one mineral only, but most are composed of a variety of different minerals, The rocks are broadly classified into three groups: (i) …
If we examine the sections of an-isotropic minerals under a convergent polarized light, the ”interference figures” can be seen. In order to observe these figures, we need to make some pre-adjustments in the polarizing microscope. Polars are crossed. Condenser lens is used below the stage to produce a converging beam. A high power objective is …
On the basis of their origin, characteristics, and information, the rocks are classified into following three types: Igneous Rocks Sedimentary (Aqeous) Rocks Metamorphic Rocks (A). IGNEOUS ROCKS: The term igneous is based on the Latin word ignis meaning fire. Thus it denotes those rocks which originated through fire. Technically speaking, these rocks were formed as …
What are the Rocks: The crust of the Earth comprises several types of rocks which range from concrete-like hardness to soap-like softness. A rock may be defined as an assemblage of a mineral such as quartz or several minerals. According to Tark and Martian, “A rock is an aggregate of minerals, sometimes chiefly or entirely …