drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...

Introduction: Cooperative teaching techniques such as jigsaw technique may encompass positive effects in promoting psycho-social climate of learning environments. The aim of this study was to determine nursing students' perception regarding psycho-social environment of the classroom and investigating the effects of two methods of programmed lecture and jigsaw puzzle in promoting students' perce...