英语论文网

A Study on Geology of Yemen
Abstract
Yemen is located in the southern edge of the Arabian Shield, formed in Precambrian times from a tangled complex of ancient rocks. In spite of the shield has acted a rigid landmass since the beginning of Cambrian time. Included within the basement complex are great belts of sedimentary rocks, now contorted, intruded, and metamorphosed, that record the growth and the decay of former mountain systems.  Through the areas of Precambrian time, the shielded presumably was subjected several times to down warping, sedimentation, orogeny, injection by plutonic rocks, and leveling before becoming immobile, a complex, but little known structural history comparable to that of other shields and former geosynclinal areas. Yemen needs to be supported against the natural disasters and reducing them, and that might be caused by the human being because of the environmental unawareness among the society, and that should be done by preparing Geo-engineering maps and environmental pollution's maps and others.
1. Introduction