Animals, plants and soils interact with one another, with the terrestrial spheres, and with the rest of the Cosmos. On land, this rich interaction creates landscape systems or geoecosystems.<BR><EM>Geoecology</EM> investigates the structure and function of geoecosystems, their components and their environment. The author develops a simple dynamic systems model, the `brash'' equation, to form the conceptual framework for the book suggesting an `ecological'' and `evolutionary'' approach.<BR> Exploring internal of `ecological'' interactions between geoecosystems and their near-surface environments - the atmosphere, hydrosphere, toposhere, and lithosphere - and external influences, both geological and cosmic, <EM>Geoecology</EM> presents geoecosystems as dynamic entities constantly responding to changes within themselves and their surroundings.<BR> An `evolutionary'' view emerges of geoecological systems, and the animals, plants, and soils comprising them, providing a new way of thinking f