GeoFogy

[Gk.] The science which Ireats the history and structure of the earth. The rocks which compose the crust of the earth have not all been formed in the same way. Some have cooled from a state of fusion, and are known igneous rocks. This cla is represented such rocks as granite, syenite, traps, and lavas. Metamorphic rocks are those which have either originally been deposited in water and have be¬ come changed into crystalline rock, or those in structure under great pre ure. Sedimentary laid down on the bed of the sea or on the land. They have all been formed from sediment washed by rain and streams from the land,and, be¬ rock. This division forms the larger part of the earth’s crust, and is the most important for the from which the geological history of the earth is worked out. These rocks are arranged in strata or layers, which have been much lifted, with curve upwards, they are called Anticlinal. They include sandstones, limestones, slates or claystones, etc., their ages depending on their relative position. When the age of a rock strata is in doubt it is frequently learned from the animal or plant fo ils it may contain. plants with seed-ve els like a crane’s bill. Most of them have showy flowers and a pungent odor. This group includes the commonly cultivated “geraniums ” which are mostly form of anything living, from which the egg and the embryo develop. Disease germs are minute spores or organisms called bacteria, bacilli, and by bacterium a smaller rod form of germ. copper. It is used in the manufacture of nume¬ rous articles, such as spoons, forks, jugs, teapots, dish-covers, salvers, etc. The proportion of each ingredient is different in different alloys. Spoons Giraffe7. and forks are made from two parts copper, one nickel, one zinc. It is hard, and can take on a tinguished bright polish.