upsetting of the ecological balance
11CONSERVATION — Introduction In consequence of the establishment in Israel of a Ministry for the Environment it is appropriate to take stock of the deep concern for the environment and its conservation which, from its earliest documents onwards, infuses Jewish… …
12science, history of — Introduction the history of science from its beginnings in prehistoric times to the 20th century. On the simplest level, science is knowledge of the world of nature. There are many regularities in nature that mankind has had to… …
13Tropical Africa — is a diverse region of the African continent that falls between the Tropic of Cancer in the northern hemisphere, at approximately 23°26 (23.4°) N latitude, and the Tropic of Capricorn in the southern hemisphere at 23°26 (23.4°) S latitude. This… …
14upset — 1 verb past tense and past participle upset (T) 1 to make someone feel unhappy or worried: I m sorry, I didn t mean to upset you. 2 to change a plan or situation in a way that causes problems: The delicate ecological balance of the area was upset …
15agricultural technology — Introduction application of techniques to control the growth and harvesting of animal and vegetable products. Soil preparation Mechanical processing of soil so that it is in the proper physical condition for planting is usually… …
16Colonization: Down to Earth —   Author(s) Harry Turtledove …
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