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Appendix A Minerals
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anticline basalt baselevel basins beds bottom calcium carbonate carbon dioxide cause chemical clay cleavage climate coast color commonly composition cone contain continental coral crystals currents debris deep delta deposits depth downcutting Earth Earth,s crust Earth,s surface earthquakes eroded erosion eruptions fault feet feldspar fissures floor flow folding formation fumaroles gases geologic glacial glaciers gneiss granite gravel horizontal igneous rocks intrusive iron irregular known laccoliths lakes land lava layers limestone lower magma marine masses material melting metals metamorphic rocks miles minerals moraines mountain movement occur ocean origin oxides particles peneplain plain planes porphyry pressure pyroxene quartz ranges reef regions result ridges rise river sand sandstone schists sea level sedimentary rocks sediments shales shallow shore siliceous slopes soil stage strata stream structure Surv syncline temperature terraces thick tributaries U. S. Geol unconformity uplift valley vertical volcanoes waves weathering wind zone