The mentioned volcanic activity in yangzhuang formation is expected to propel the study of the proterozoic chronology and tectono - sedimentary evolution of north china 杨庄期火山活动可能提供华北地区中元古代年代地层学和构造沈积演化研究的新证据。
Former people have developed abundant research of drought and flood in summer , but have less research of that in spring and respective month over north china 前人对华北地区夏季的旱涝进行了大量的研究，但对春季以及各月的旱涝情况的研究却相对很少。
Xiao yun : miyun reservoir covers an area of 224 square meters . and its magnificence in terms of area and capacity is famous in the entire north china 小云：密云水库总库区224平方公里。密云水库水面之宽，库容量之大，库坝工程之宏伟，在华北地区首屈一指。
Recently , with the exception of the ocean and land above 5000 meters altitude bryophytes can be found worldwide , including the antarctica 河北省高原山地众多，地形地貌复杂，自然条件得天独厚，苔藓植物资源丰富多样，在华北地区具有一定的代表性和典型性。
“ environmental strategies of intensive agriculture in the north of china ” ( esia ) is a sino - german cooperative program in the field of agro - environment protection “中国华北地区集约化农业的环境战略” （简称esia ）是中德政府在中国农业生态环境保护领域的合作项目。
The summer climate of north china is wetter with more frequent flood from the 1950s to the 1960s and drier with more frequent drought from the 1980s to the 1990s 夏季华北地区五十年代到六十年代中期气候偏湿，以雨涝多见；八十年代到九十年代初期气候偏干，以干旱多见。
The extensional and transtentional structure existed in huabei belongs to vent fault , fracture is mainly stepwise normal fault , whose preservation condition is not good 华北地区多为张性，张扭性构造，属于排气断层，形成的断裂多为阶梯状，以正断层为主，保存条件欠佳。
By using the psu / ncar mm5 model , we made a numerical simulation about the severe sand - dust storm that occured in the north china on 20march in 2002 20 ”强沙尘暴天气过程进行了数值模拟，并利用模式输出的各物理量对沙尘暴进行诊断分析，得出了华北地区沙尘暴的形成、发展机制。
