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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • Agriculture ; Agroclimatologie ; Aridité ; Bioclimatologie ; Climat ; Climatologie appliquée ; Densité ; Etats-Unis ; Frontière ; Great Plains ; Géographie physique ; Humidité atmosphérique ; Population active agricole ; Précipitation ; Sécheresse
  • sur la densité de la population agricole et la moyenne annuelle des précipitations ont été testées sur la région des Grande Plaines aux Etats-Unis: il y a une forte corrélation entre les variations spatiales de la densité de la population agricole et
  • 1980
  • Fotometriceskie metody opredelenija opticeski aktivnyh sloev ryhlyh porod i pocv. (Méthodes photométriques pour la détermination des couches optiquement actives de roches meubles et de sols)
  • 1980
  • Svjaz'urozaja zerna ozimoj psenicy s fotosinteticeski aktivnoj radiaciej. (Relation entre le rendement du blé d'hiver et la radiation photosynthétiquement active)
  • 1980
  • From the study the following aspects of the evolution of the sedimentary regime are characterized: 1establishment of an active bottom current circulation during the early Eocene, concomitant with a clear thermal stratification of the water masses
  • | 2development of a highly fluctuating bottom current regime during the Oligocene, spicule-rich contourites being implaced during periods of active bottom currents| 3changes in the sedimentary regime at the early middle Miocene boundary characterized
  • by decreasing bottom current and increasing sedimentation rates| 4active bottom current, decreasing dissolution and markel increase of the sedimentation rates in the early Pliocene, that contributed to active building of a sedimentary ridge at the foot
  • 1980
  • Human activities and geomorphic processes: the example of recreation pressure on the Northern Ireland coast in Coasts under stress.
  • 1980
  • Author evaluates the marks of periglacial environment within the system of climamorphogenetic regions of the world. He suggests to distinguish the active periniveoglacial environment, with and without the simultaneous occurrence of glaciers
  • 1980
  • Intrusion of basaltic sills into highly porous sediments, and resulting hydrothermal activity
  • 1980
  • Absorption of photosynthetically active radiation by the leaves of grass species: inter-and intraspecific variations and phénotypic response to water stress
  • 1980
  • Climatic constraints and human activities.
  • 1980
  • science has unambiguously demonstrated that most of the karst phenomena on the surface of the Earth reflect the effect of the activity of the biological world. (CK).
  • 1980
  • . This situation is unique in comparison to the amount of morphodynamic activity actually prevailing in the adjacent regions with different climates, i.e. the eastern Lowveld and Middleveld of Swaziland, and permits to more precisely define the realm of validity
  • 1980
  • of Tertiary age, was surveyed, and several recently activated faults were encountered. These faults indicate the subsidence of the floor of the Biscay Abyssal Plain, probably due to the cooling of the underlying crust as well as to the accumulation
  • 1980
  • , Israel, China, USSR and the United States. This conference did not deal with the natural occurrence of deserts, but concerned itself with human activities which degrade land that would otherwise be productive.
  • 1980
  • , which activated a weak trough filled with potentially unstable air. (JPB).
  • 1980
  • At the present time wind is the most active geomorphic agent in the Sahara. In addition, fixed dunes along the margins of the desert testify to the former extent of wind action during times of even drier climate. Satellite images and air photos
  • 1980
  • structure. The block-faulted form is considered to have originated during the rifting of the Armorican Continental margin and may have been influenced by a tectonic Pattern caused by the earlier activity of the south Armorican shear zone.
  • 1980
  • and ridge pattern, aligned perpendicular to the slope, supports Henoch's (1960) hypothesis that solifluction is active. Evidence for differential frost heave and thrusting was observed in the fen and on the slopes adjacent to it. Fluvial processes within
  • 1980
  • cores in the equatorial Pacific and Gulf of Mexico were analyzed by neutron activation and/or electron microprobe. Chemical data from this study are used to correlate the Y-8 ash layer of the Gulf of Mexico with the Los Chocoyos Ash. The recognition
  • 1980