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Preview: About.com Geology: Most Popular Articles

About.com Geology: Most Popular Articles



These articles are the most popular over the last month.



Published: Mon, 13 Mar 2017 12:04:56 +0000

 



Identify Almost Any Rock with This Table

2017-03-13T12:04:56Z

Identify 44 of the most common igneous, sedimentary and metamorphic rock types with this chart.



The Density of Common Rocks and Minerals

2017-03-13T12:04:56Z

Information and tables on the densities of the most common rocks and minerals, with a look at porosity.



What You Need to Know About Igneous Rocks

2017-03-13T12:04:56Z

All igneous rocks have one thing in common: they occur from the cooling and solidification of molten material.



Why the Earth's Crust Is So Important

2017-03-13T12:04:56Z

The 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.



About Radon

2017-03-13T12:04:56Z

Radon is a minor health threat and a geological curiosity.



Where to Look for Rocks and Minerals

2017-03-13T12:04:56Z

Learn the basics of rocks and minerals, where to find them and what they mean in their context.



Use This Master Index of Rock Pictures

2017-03-13T12:04:56Z

A master alphabetical guide to igneous, sedimentary and metamorphic rocks. Includes pictures of each type as well as a brief description.



10 Steps to Help You Identify Any Mineral

2017-03-13T12:04:56Z

Mineral identification starts with picking a good specimen.



The Most Common Green Minerals in Nature

2017-03-13T12:04:56Z

A guide to the most common and significant green and greenish minerals. Includes images and descriptions​ of each type.



What a Black Mineral Is Most Likely to Be

2017-03-13T12:04:56Z

A guide to the most common and significant black minerals.



What Is My Red or Pink Mineral?

2017-03-13T12:04:56Z

A guide to the most common and significant red and pink minerals.



Pictures of Geologic Features and Processes

2017-03-13T12:04:56Z

Pictures of geologic features and the processes of geology.



Geo-Quiz 10: Volcanoes

2017-03-13T12:04:56Z

Who wants to be a geo-whiz? The trivia game--subject: VOLCANOES.



What Makes Metamorphic Rocks Unique

2017-03-13T12:04:56Z

Metamorphic rocks are formed by great heat and pressure. Most of the thousands of rare minerals known to science occur in these rocks.



Everything You Need to Know About the Lithosphere

2017-03-13T12:04:56Z

Everything you need to know about the lithosphere, including its composition, structure and thickness.



What Are the Most Common Blue and Purple...

2017-03-13T12:04:56Z

Blue, violet and purple colors can be seen in many different minerals. Here is a look at some of the most common.



What Is Chemical Weathering?

2017-03-13T12:04:56Z

A short explanation of chemical weathering and carbonation, hydration, hydrolysis and oxidation.



Identify Typical Minerals with This Master...

2017-03-13T12:04:56Z

My master guide to annotated pictures to help you identify minerals: typical examples of rock-forming, accessory, and rare or notable minerals.



What to Know About Sedimentary Rocks

2017-03-13T12:04:56Z

Introducing sedimentary rocks, second of the three great rock classes (along with igneous and metamorphic rocks).



Present Plate Motions, Eurasia/Africa

2017-03-13T12:04:56Z

Current tectonic plate motions, eastern hemisphere.



6 Things to Know About the Earth's Mantle

2017-03-13T12:04:56Z

A six-part look at the basics of the Earth's mantle, the part between the crust and the core.



Subduction: The Sinking of Tectonic Plates

2017-03-13T12:04:56Z

Subduction occurs along convergent boundaries involving at least one oceanic plate. As the tectonic plates collide, one sinks below the other.



How to Look at a Rock Like a Geologist

2017-03-13T12:04:56Z

Notes on the most basic operation in geology.



Diagenetic Minerals

2017-03-13T12:04:56Z

Minerals that form during the consolidation of a rock from sediment.



How to Make a Realistic Volcano

2017-03-13T12:04:56Z

Moviemakers and scientists have gone beyond vinegar and baking soda.



How to Distinguish Brown Minerals - Photo Gallery

2017-03-13T12:04:56Z

A guide to the most common and significant brown minerals.



Plutonic Rocks - Definition and Examples

2017-03-13T12:04:56Z

Plutonic rocks form from igneous intrusions deep in the Earth's crust. Common plutonic rocks include granite, tonalite and quartz diorite.



Metamorphic Fabrics

2017-03-13T12:04:56Z

The six basic fabric types found in metamorphic rocks.



What are Convergent Plates?

2017-03-13T12:04:56Z

Convergent plate boundaries form the world's most intense volcanoes, deepest ocean trenches and highest mountains.



Fault Types with Diagrams

2017-03-13T12:04:56Z

Faulting can cause major earthquakes and create large mountain chains. Get a more in-depth look, with helpful diagrams, here.



Metamorphic Minerals

2017-03-13T12:04:56Z

Minerals forming in solid rocks under prolonged heat and pressure.



Stop 33, Merced Formation: Soft-Sediment...

2017-03-13T12:04:56Z

A photographic field trip to classic subduction-related rocks across northern California. Page 115.



Index Fossils: The Key to Telling Deep Time

2017-03-13T12:04:56Z

Index fossils come from organisms that were distinct, widespread, abundant and short lived. These fossils help define intervals of geologic time.



Mineral Pictures A to Z

2017-03-13T12:04:56Z

A-to-Z list of minerals shown on About.com Geology.



Plate Tectonics Explains How the Earth's...

2017-03-13T12:04:56Z

Start here to learn the basics of plate tectonics.



Weathering: Details of This Central Geologic...

2017-03-13T12:04:56Z

The definition of weathering is the gradual destruction of rock under surface conditions. Think of the Grand Canyon or other rock formations.



What Are Dikes and How Do They Form?

2017-03-13T12:04:56Z

Dikes are igneous or sedimentary intrusions that form in the pre-existing, vertical fractures of older rock.



All About Granite

2017-03-13T12:04:56Z

class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Granite is the



Sandstone: What It Is and What It Tells Us

2017-03-13T12:04:56Z

Sandstone is made up of three ingredients, sand particles, matrix and cement, and can reveal a great deal of information to geologists.



The Story of Basalt

2017-03-13T12:04:56Z

Basalt has a key role in Earth's tectonic cycle.



How to Tell the Feldspar Minerals Apart

2017-03-13T12:04:56Z

An overview of the most common mineral in the Earth's crust, feldspar- how to identify it and further information.



Where Are the Greatest Earthquake Threats in...

2017-03-13T12:04:56Z

The United Nations' global map of seismic hazard



Transform Boundaries - When Earth's Plates Move...

2017-03-13T12:04:56Z

Transform boundaries or transform faults occur wherever the Earth's plates move past each other.



What's the Difference Between Mud, Clay and Silt?

2017-03-13T12:04:56Z

What's the difference between clay, mud, sand and silt? Take a look at this sedimentary grain size chart for more information.



What Is a Pluton?

2017-03-13T12:04:56Z

Plutons are deep-seated bodies of large-grained igneous rock. They can be exposed at the surface if erosion wears away overlying rock.



Geologic Destinations for California Tourists

2017-03-13T12:04:56Z

If you're going to California, be sure to put some of these geologic attractions on your must-see list.



Uranium-Lead Dating

2017-03-13T12:04:56Z

Uranium-lead method is the oldest and, when done carefully, the most reliable isotopic dating method.



What You Should Know About the San Andreas Fault

2017-03-13T12:04:56Z

Home page for everything about the San Andreas fault: where it is, how it behaves, what it means.



What Counts as a Rock to a Geologist?

2017-03-13T12:04:56Z

Everyone knows what a rock is, until you ask what it is exactly.



Hotspots: Spouts Beneath the Plates

2017-03-13T12:04:56Z

Hotspots and other signs of something deep going on in the Earth's mantle.



What Is Geology?

2017-03-13T12:04:56Z

The whole of Earth sciences, compressed to a nutshell.



What Is My Yellow Mineral?

2017-03-13T12:04:56Z

A guide to the most common and significant yellow minerals.



Transportation

2017-03-13T12:04:56Z

A short explanation of transportation, part of erosion.



About Isotopic Dating: Yardsticks for Geologic...

2017-03-13T12:04:56Z

Radioactivity and the barbecue model of dating.



Steno Started Geology with a Few Simple...

2017-03-13T12:04:56Z

Steno (Niels Stensen) first set forth some of the basic principles that all geologists follow.



The Scientific Definition of a Mineral

2017-03-13T12:04:56Z

Minerals meet four criteria, more or less strict.



Tectonic Plate Boundaries, Eastern Hemisphere

2017-03-13T12:04:56Z

Plate boundaries of the Eastern Hemisphere: divergent, convergent, and transform.



Potassium-Argon Dating Methods

2017-03-13T12:04:56Z

Potassium-argon isotopic dating is especially useful for determining the age of lavas.



More Than 50 Different Landforms in Pictures

2017-03-13T12:04:56Z

Find and see geological landforms at About.com Geology.



The Deep Meaning of Lost City

2017-03-13T12:04:56Z

A newly discovered seafloor structure is yet another product of serpentinization



What Is the Most Common Mineral on Earth?

2017-03-13T12:04:56Z

This question has several answers, depending on what a mineral is and what part of the Earth we're talking about.



Hydrothermal Vein Minerals

2017-03-13T12:04:56Z

Minerals formed during injection of deep hot fluids and pegmatite formation



Erosion, Defined and Explained

2017-03-13T12:04:56Z

Erosion is a key concept in geology - what causes it and how does it shape the Earth's surface?



How to Use the Mohs Hardness Scale to Identify...

2017-03-13T12:04:56Z

The 10-mineral Mohs scale of relative hardness is based on which minerals scratch each other.



All About Lithification

2017-03-13T12:04:56Z

Lithification refers to the process in which sediments are turned into rigid rock through compaction and cementation.



These Are the World's Largest Calderas

2017-03-13T12:04:56Z

Here is a table of the world's largest known calderas. Calderas, or supervolcanoes, are located in Russia, the United States, Argentina, and more.



Geologic Time Scale: Precambrian Time

2017-03-13T12:04:56Z

The Precambrian part of the official geologic time scale.



What is an Orogeny?

2017-03-13T12:04:56Z

A short explanation of orogenies, or mountain-building episodes, with examples.



How Old Is the Ocean Floor?

2017-03-13T12:04:56Z

The oceanic crust is much younger than the continental crust, rarely reaching more than 180 million years in age.



A Detailed Map of Tectonic Plate Boundaries

2017-03-13T12:04:56Z

This map gives a detailed look at the boundaries, motions and hotspots of the world's major tectonic plates.



10 Steps to Take for Earthquake Preparedness

2017-03-13T12:04:56Z

Developed by earthquake professionals, these 10 steps of action are important elements of a disaster-resilient society.



The Bre-X Gold Scandal, History's Biggest...

2017-03-13T12:04:56Z

First 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.



Divergent Boundaries: Where the Earth Splits...

2017-03-13T12:04:56Z

Take a deeper look at how oceans and continents split apart and form new Earth at divergent boundaries.



Translate Names Between Gemstones and Minerals

2017-03-13T12:04:56Z

Big list of mineral names and their corresponding gemstone names.



Measuring Plate Motion

2017-03-13T12:04:56Z

The five ways we track the motion of the lithospheric plates.



Top-Level Geologic Time Scale: Eons, Eras and...

2017-03-13T12:04:56Z

The eons, eras and periods of the official geologic time scale.



What rock is my granite countertop or tile,...

2017-03-13T12:04:56Z

The granites of geology and commerce are quite different.



Mechanical Weathering

2017-03-13T12:04:56Z

A short explanation of mechanical weathering.



Stop 6, Putnam Peak Basalt: The Setting

2017-03-13T12:04:56Z

A photographic field trip to classic subduction-related rocks across northern California. Page 27.



Geologic Eons and Eras

2017-03-13T12:04:56Z

The four eons and ten eras of the official geologic time scale.



What Is an Ophiolite?

2017-03-13T12:04:56Z

Not a rock type, it's a whole assemblage of crustal rocks.



Carbonate Compensation Depth:

2017-03-13T12:04:56Z

Calcium Carbonate Depth (CCD) explains why limestone formation is normally associated with shallow seas.



Rock Cycle Diagram

2017-03-13T12:04:56Z

The rock cycle as I see it. Geology.



Holes in Rocks

2017-03-13T12:04:56Z

Geologists have named a variety of holes.



Quartz: How to Tell It, Different Kinds, What...

2017-03-13T12:04:56Z

Quartz is essential to the land as we know it.



Before You Buy a Rock Collection

2017-03-13T12:04:56Z

Advice on what to look for in those 'candy boxes' full of little rocks.



Florida Caverns, Jackson County

2017-03-13T12:04:56Z

Florida Caverns is one of Florida's geological attractions. Page 4.



About Mudrocks - Optional Ingredients and...

2017-03-13T12:04:56Z

The most widespread sedimentary rock type, despite its looks, is not a simple stone.



What to Know Before You Buy a Magnifier

2017-03-13T12:04:56Z

What to think about and look for when you set out to get a nice magnifier.



Map of World Hotspots

2017-03-13T12:04:56Z

A convenient map showing the most commonly accepted hotspots.



Seismic Hazard Zones, San Francisco

2017-03-13T12:04:56Z

Map showing areas prone to liquefaction and landsliding, San Francisco area, from California Department of Conservation Division of Mines and Geology.



Fair Use Policy for Images

2017-03-13T12:04:56Z

Conditions for use of images from geology.about.com.



Pillow Lava Pictures

2017-03-13T12:04:56Z

Pillow lavas from the present to the Ordovician.



What's the Difference Between Geology,...

2017-03-13T12:04:56Z

While they have the exact same literal definition, Earth science, geoscience and geology can mean different things depending on who you ask.



Petroleum in a Nutshell

2017-03-13T12:04:56Z

The basics about this important geologic commodity.



Drilling Volcanoes

2017-03-13T12:04:56Z

Drilling into active volcanoes is not as crazy as you think.



What Exactly is "Deep Time"?

2017-03-13T12:04:56Z

Deep time refers to the entirety of geologic history, an unimaginable length of time that goes far beyond our human scale.



Primary Minerals

2017-03-13T12:04:56Z

Minerals that form during the solidification of a melt.



Desert Pavement

2017-03-13T12:04:56Z

Desert pavement in Joshua Tree National Park and on Mars, with notes from the Geology Guide.



Diagenesis: Gentle Changes That Turn Sediment...

2017-03-13T12:04:56Z

About diagenesis, the stage between sediment and rock.