Published: Mon, 13 Mar 2017 12:04:56 +0000
2017-03-13T12:04:56ZIdentify 44 of the most common igneous, sedimentary and metamorphic rock types with this chart.
2017-03-13T12:04:56ZInformation and tables on the densities of the most common rocks and minerals, with a look at porosity.
2017-03-13T12:04:56ZAll igneous rocks have one thing in common: they occur from the cooling and solidification of molten material.
2017-03-13T12:04:56ZThe Earth's crust is the thin, rocky layer that makes up our planet's shell. It is exceptionally important, and not just because we live on it.
2017-03-13T12:04:56ZRadon is a minor health threat and a geological curiosity.
2017-03-13T12:04:56ZLearn the basics of rocks and minerals, where to find them and what they mean in their context.
2017-03-13T12:04:56ZA master alphabetical guide to igneous, sedimentary and metamorphic rocks. Includes pictures of each type as well as a brief description.
2017-03-13T12:04:56ZMineral identification starts with picking a good specimen.
2017-03-13T12:04:56ZA guide to the most common and significant green and greenish minerals. Includes images and descriptions of each type.
2017-03-13T12:04:56ZA guide to the most common and significant black minerals.
2017-03-13T12:04:56ZA guide to the most common and significant red and pink minerals.
2017-03-13T12:04:56ZPictures of geologic features and the processes of geology.
2017-03-13T12:04:56ZWho wants to be a geo-whiz? The trivia game--subject: VOLCANOES.
2017-03-13T12:04:56ZMetamorphic rocks are formed by great heat and pressure. Most of the thousands of rare minerals known to science occur in these rocks.
2017-03-13T12:04:56ZEverything you need to know about the lithosphere, including its composition, structure and thickness.
2017-03-13T12:04:56ZBlue, violet and purple colors can be seen in many different minerals. Here is a look at some of the most common.
2017-03-13T12:04:56ZA short explanation of chemical weathering and carbonation, hydration, hydrolysis and oxidation.
2017-03-13T12:04:56ZMy master guide to annotated pictures to help you identify minerals: typical examples of rock-forming, accessory, and rare or notable minerals.
2017-03-13T12:04:56ZIntroducing sedimentary rocks, second of the three great rock classes (along with igneous and metamorphic rocks).
2017-03-13T12:04:56ZCurrent tectonic plate motions, eastern hemisphere.
2017-03-13T12:04:56ZA six-part look at the basics of the Earth's mantle, the part between the crust and the core.
2017-03-13T12:04:56ZSubduction occurs along convergent boundaries involving at least one oceanic plate. As the tectonic plates collide, one sinks below the other.
2017-03-13T12:04:56ZNotes on the most basic operation in geology.
2017-03-13T12:04:56ZMinerals that form during the consolidation of a rock from sediment.
2017-03-13T12:04:56ZMoviemakers and scientists have gone beyond vinegar and baking soda.
2017-03-13T12:04:56ZA guide to the most common and significant brown minerals.
2017-03-13T12:04:56ZPlutonic rocks form from igneous intrusions deep in the Earth's crust. Common plutonic rocks include granite, tonalite and quartz diorite.
2017-03-13T12:04:56ZThe six basic fabric types found in metamorphic rocks.
2017-03-13T12:04:56ZConvergent plate boundaries form the world's most intense volcanoes, deepest ocean trenches and highest mountains.
2017-03-13T12:04:56ZFaulting can cause major earthquakes and create large mountain chains. Get a more in-depth look, with helpful diagrams, here.
2017-03-13T12:04:56ZMinerals forming in solid rocks under prolonged heat and pressure.
2017-03-13T12:04:56ZA photographic field trip to classic subduction-related rocks across northern California. Page 115.
2017-03-13T12:04:56ZIndex fossils come from organisms that were distinct, widespread, abundant and short lived. These fossils help define intervals of geologic time.
2017-03-13T12:04:56ZA-to-Z list of minerals shown on About.com Geology.
2017-03-13T12:04:56ZStart here to learn the basics of plate tectonics.
2017-03-13T12:04:56ZThe definition of weathering is the gradual destruction of rock under surface conditions. Think of the Grand Canyon or other rock formations.
2017-03-13T12:04:56ZDikes are igneous or sedimentary intrusions that form in the pre-existing, vertical fractures of older rock.
2017-03-13T12:04:56Zclass="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Granite is the
2017-03-13T12:04:56ZSandstone is made up of three ingredients, sand particles, matrix and cement, and can reveal a great deal of information to geologists.
2017-03-13T12:04:56ZBasalt has a key role in Earth's tectonic cycle.
2017-03-13T12:04:56ZAn overview of the most common mineral in the Earth's crust, feldspar- how to identify it and further information.
2017-03-13T12:04:56ZThe United Nations' global map of seismic hazard
2017-03-13T12:04:56ZTransform boundaries or transform faults occur wherever the Earth's plates move past each other.
2017-03-13T12:04:56ZWhat's the difference between clay, mud, sand and silt? Take a look at this sedimentary grain size chart for more information.
2017-03-13T12:04:56ZPlutons are deep-seated bodies of large-grained igneous rock. They can be exposed at the surface if erosion wears away overlying rock.
2017-03-13T12:04:56ZIf you're going to California, be sure to put some of these geologic attractions on your must-see list.
2017-03-13T12:04:56ZUranium-lead method is the oldest and, when done carefully, the most reliable isotopic dating method.
2017-03-13T12:04:56ZHome page for everything about the San Andreas fault: where it is, how it behaves, what it means.
2017-03-13T12:04:56ZEveryone knows what a rock is, until you ask what it is exactly.
2017-03-13T12:04:56ZHotspots and other signs of something deep going on in the Earth's mantle.
2017-03-13T12:04:56ZThe whole of Earth sciences, compressed to a nutshell.
2017-03-13T12:04:56ZA guide to the most common and significant yellow minerals.
2017-03-13T12:04:56ZA short explanation of transportation, part of erosion.
2017-03-13T12:04:56ZRadioactivity and the barbecue model of dating.
2017-03-13T12:04:56ZSteno (Niels Stensen) first set forth some of the basic principles that all geologists follow.
2017-03-13T12:04:56ZMinerals meet four criteria, more or less strict.
2017-03-13T12:04:56ZPlate boundaries of the Eastern Hemisphere: divergent, convergent, and transform.
2017-03-13T12:04:56ZPotassium-argon isotopic dating is especially useful for determining the age of lavas.
2017-03-13T12:04:56ZFind and see geological landforms at About.com Geology.
2017-03-13T12:04:56ZA newly discovered seafloor structure is yet another product of serpentinization
2017-03-13T12:04:56ZThis question has several answers, depending on what a mineral is and what part of the Earth we're talking about.
2017-03-13T12:04:56ZMinerals formed during injection of deep hot fluids and pegmatite formation
2017-03-13T12:04:56ZErosion is a key concept in geology - what causes it and how does it shape the Earth's surface?
2017-03-13T12:04:56ZThe 10-mineral Mohs scale of relative hardness is based on which minerals scratch each other.
2017-03-13T12:04:56ZLithification refers to the process in which sediments are turned into rigid rock through compaction and cementation.
2017-03-13T12:04:56ZHere is a table of the world's largest known calderas. Calderas, or supervolcanoes, are located in Russia, the United States, Argentina, and more.
2017-03-13T12:04:56ZThe Precambrian part of the official geologic time scale.
2017-03-13T12:04:56ZA short explanation of orogenies, or mountain-building episodes, with examples.
2017-03-13T12:04:56ZThe oceanic crust is much younger than the continental crust, rarely reaching more than 180 million years in age.
2017-03-13T12:04:56ZThis map gives a detailed look at the boundaries, motions and hotspots of the world's major tectonic plates.
2017-03-13T12:04:56ZDeveloped by earthquake professionals, these 10 steps of action are important elements of a disaster-resilient society.
2017-03-13T12:04:56ZFirst there is a mountain of gold, then there is no mountain, then there is no mining company in the gold industry's greatest case of fraud.
2017-03-13T12:04:56ZTake a deeper look at how oceans and continents split apart and form new Earth at divergent boundaries.
2017-03-13T12:04:56ZBig list of mineral names and their corresponding gemstone names.
2017-03-13T12:04:56ZThe five ways we track the motion of the lithospheric plates.
2017-03-13T12:04:56ZThe eons, eras and periods of the official geologic time scale.
2017-03-13T12:04:56ZThe granites of geology and commerce are quite different.
2017-03-13T12:04:56ZA short explanation of mechanical weathering.
2017-03-13T12:04:56ZA photographic field trip to classic subduction-related rocks across northern California. Page 27.
2017-03-13T12:04:56ZThe four eons and ten eras of the official geologic time scale.
2017-03-13T12:04:56ZNot a rock type, it's a whole assemblage of crustal rocks.
2017-03-13T12:04:56ZCalcium Carbonate Depth (CCD) explains why limestone formation is normally associated with shallow seas.
2017-03-13T12:04:56ZThe rock cycle as I see it. Geology.
2017-03-13T12:04:56ZGeologists have named a variety of holes.
2017-03-13T12:04:56ZQuartz is essential to the land as we know it.
2017-03-13T12:04:56ZAdvice on what to look for in those 'candy boxes' full of little rocks.
2017-03-13T12:04:56ZFlorida Caverns is one of Florida's geological attractions. Page 4.
2017-03-13T12:04:56ZThe most widespread sedimentary rock type, despite its looks, is not a simple stone.
2017-03-13T12:04:56ZWhat to think about and look for when you set out to get a nice magnifier.
2017-03-13T12:04:56ZA convenient map showing the most commonly accepted hotspots.
2017-03-13T12:04:56ZMap showing areas prone to liquefaction and landsliding, San Francisco area, from California Department of Conservation Division of Mines and Geology.
2017-03-13T12:04:56ZConditions for use of images from geology.about.com.
2017-03-13T12:04:56ZPillow lavas from the present to the Ordovician.
2017-03-13T12:04:56ZWhile they have the exact same literal definition, Earth science, geoscience and geology can mean different things depending on who you ask.
2017-03-13T12:04:56ZThe basics about this important geologic commodity.
2017-03-13T12:04:56ZDrilling into active volcanoes is not as crazy as you think.
2017-03-13T12:04:56ZDeep time refers to the entirety of geologic history, an unimaginable length of time that goes far beyond our human scale.
2017-03-13T12:04:56ZMinerals that form during the solidification of a melt.
2017-03-13T12:04:56ZDesert pavement in Joshua Tree National Park and on Mars, with notes from the Geology Guide.
2017-03-13T12:04:56ZAbout diagenesis, the stage between sediment and rock.