ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00693.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00694.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00695.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00696.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00697.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00698.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Current problems with the ozone layer and rising carbon dioxide levels have highlighted the importance of the atmosphere, with its delicate balance of gases. In fact, the atmosphere has been changing since the Earth formed. From anoxic beginnings to its current oxygenated state, it has influenced depositional processes on the Earth's surface and helped the development of active, oxygen‐breathing life forms that culminated in ourselves. Evidence for changes in the atmosphere is found in the sediments accumulated on the Earth's surface, where fossils are also preserved. In this article the major geological aspects of the atmosphere's evolution are considered; in particular, the role of oxygen is aire

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00699.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00700.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

In response to a number of requests, we propose to report regularly on major volcanic and seismic activity. Unfortunately, this cannot be a hot‐news service. Reports of geoevents are published monthly in the United States by the Scientific Event Alert Network (SEAN); bur each one is issued during the month following the report period, it takes about two months to reach Britain by mail, and the essence of it then has to be distilled by us to meet a Geology Today deadline that is generally two months prior to the cover date. What we can do, however, is to provide a continuous record. As the information for 1989 is not yet complete, a convenient starting date would appear to be January 1989. This first part therefore covers the first six months of 1989 (the ‘period’ referred to in the text below); the second part will cover the latter half of that year; and thereafter, reports will appear as appropriate, each covering a reporting period of at least three months. We are grateful 10 the SEAN for allowing us to use its reports as the basis of our summ

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00701.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1990.tb00702.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY