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Ecosystems, Conservation, Ocean Studies, GIS, Hydrology - you can download free digital textbooks on all this and more from the Earth Science section of National Academies Press. Price listed is for delivery of paperback copies.
Under the Science, Maths & Technology subject seven geology courses are available such as "Practising science: Reading the rocks and ecology", "Plate Tectonics", and "Minerals and the crystalline state."
We provide science about the natural hazards that threaten lives and livelihoods; the water, energy, minerals, and other natural resources we rely on; the health of our ecosystems and environment; and the impacts of climate and land-use change.