Recent observations on the geochemistry, biogeochemistry and stable isotope systematics of waters, soils and sediments of the Amazon region indicate the profound influence of biological processes on the nature of the surface and near surface materials. These same materials provide evidence for major change in vegetation types and climate during the recent past. The chemistry of local soils and waters provides key indicators of the agricultural and mineral resource potential of various regions. The extremely deep bio-weathering in the Amazon system has produced many important and new types of mineral deposits. In regions of intense and deep leaching, the input of many chemical species may be dominated by rain and aerosols.
Library of Congress Cataloging-in-Publication Data (Revised for volume F) The Natural environment and the biogeochemical cycles. (The Handbook of environmental chemistry; v, 1, pari A-l Includes bibliographical references and indexes. 1. Biogeochemical cycles-i-Collected works . 2. Environmental chemistry--Collected works .
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