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He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Abandoned Wells: a hazard because wells left on vacated lands can channel water contaminated by pesticides and fertilizer straight down into the water table. Abrasion: the wearing away of rock surfaces by small particles moved by air or water.Abrasiveness also seems to be the one quality currently shared by most political appointees and prominent heads of state. Acid: a substance with a p H less than 7 due to prevalent hydrogen ions. The human stomach contains hydrochloric acid with a p H of 1; battery acid is stronger, but not by much. Acid Rain: precipitation heavy with nitric and sulfuric acid.Ancient astronomical knowledge can be inferred through the study of the alignments and other aspects of these archaeological sites.SYNONYMS OR RELATED TERMS: archeology (from archaia"CATEGORY: and "logos"DEFINITION: science knowledge or theory)" branch The scientific study and reconstruction of the human past through the systematic recovery of the physical remains of man's life and cultures.The field includes the study of mathematical correlations between archaeological features and the movements of celestial bodies.Some sites (Stonehenge, New Grange) show a definite interest in simple solar observations.

The Greek derivation of the word "geology" refers only to the Earth, but since the beginning of the space age, the field has expanded to include the study of the solid matter of other celestial bodies, such as Mars and the Moon.

The glossary that follows assumes a definition of ecology--the study of interactions between organisms and their environment--much wider than what fits under the field's habitual statistical persona.

Ecofeminism and ecopsychology are mentioned, for example, as are terms from organic gardening and permaculture.

Adaptation: how living things change what they do or what they are to survive in a particular environment.

In this the organism is not a passive recipient of external circumstances; the relationship is interactive. Aggradation: a downward accumulation of stream-carried inorganic matter.