shifting period

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• Shifting cultivation — For methods, see slash and burn Shifting cultivation is an agricultural system in which plots of land are cultivated temporarily, then abandoned. This system often involves clearing of a piece of land followed by several years of wood harvesting… …   Wikipedia

• shifting agriculture — ▪ agriculture       system of cultivation that preserves soil fertility by plot (field) rotation, as distinct from crop rotation. In shifting agriculture a plot of land is cleared and cultivated for a short period of time; then it is abandoned… …   Universalium

• shifting agriculture — /ʃɪftɪŋ ˈægrəkʌltʃə/ (say shifting agruhkulchuh) noun a form of agriculture in which an area of land is cleared and cultivated, and after a period of time abandoned for a fresh area, for a variety of reasons ranging from deliberate fallowing to… …  

• Shifting Attitudes in a Changing World — ▪ 1998 by Gro Harlem Brundtland Gro Harlem Brundtland is a physician who left medicine to launch a career in politics. During the time she served as prime minister of Norway (February October 1981, 1986 89, and 1990 96), she was the dominant… …   Universalium

• shifting cultivation —   a farming system in which a small tribal group cuts and burns the natural vegetation before cultivating the land. After a number of years the land becomes depleted and the group moves to a new area. The original land will recover after a period …   Geography glossary

• shifting — shift·ing || ʃɪftɪŋ n. moving, changing, varying ʃɪft n. scheduled work period; change in position, change in direction; replacement, substitution; transfer, exchange; ruse, trick; loose fitting woman s dress; woman s slip v. move; cause… …   English contemporary dictionary

• Migration Period — This article is about European migrations in the early part of the first millennium A.D.. For prehistoric migrations, see Human migration. For the 2003 Canadian film, see The Barbarian Invasions. 2nd to 5th century simplified migrations. See also …   Wikipedia

• Mumun pottery period — Hangul 민무늬 토기 시대 Hanja 無文土器時代 Revised Romanization …   Wikipedia

• Permian Period — Interval of geologic time, 290–248 million years ago. The last of the six periods of the Paleozoic Era, it follows the Carboniferous Period. During the Permian, the continents joined to form a single supercontinent, Pangea. Hot, dry conditions… …   Universalium

• Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

• Last glacial period — Last glacial redirects here. For the period of maximum glacier extent during this time, see Last Glacial Maximum. The last glacial period was the most recent glacial period within the current ice age occurring during the last years of the… …   Wikipedia