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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: Wed, 07 Dec 2016 11:18:44 +0000

 



Identify Almost Any Rock with This Table

2016-12-07T11:18:44Z

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



What You Need to Know About Igneous Rocks

2016-12-07T11:18:44Z

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



Use This Master Index of Rock Pictures

2016-12-07T11:18:44Z

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



What Are the Most Common Blue and Purple...

2016-12-07T11:18:44Z

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



Why the Earth's Crust Is So Important

2016-12-07T11:18:44Z

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.



The Density of Common Rocks and Minerals

2016-12-07T11:18:44Z

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



What a Black Mineral Is Most Likely to Be

2016-12-07T11:18:44Z

A guide to the most common and significant black minerals.



The Most Common Green Minerals in Nature

2016-12-07T11:18:44Z

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



What to Know About Sedimentary Rocks

2016-12-07T11:18:44Z

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



What Is My Red or Pink Mineral?

2016-12-07T11:18:44Z

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



Identify Typical Minerals with This Master...

2016-12-07T11:18:44Z

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



10 Steps to Help You Identify Any Mineral

2016-12-07T11:18:44Z

Mineral identification starts with picking a good specimen.



What Makes Metamorphic Rocks Unique

2016-12-07T11:18:44Z

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



What Rocks Erode Into: Minerals of the Earth's...

2016-12-07T11:18:44Z

The thousands of minerals known in rocks become a mere handful at the Earth's surface.



Sandstone: What It Is and What It Tells Us

2016-12-07T11:18:44Z

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



Index Fossils: The Key to Telling Deep Time

2016-12-07T11:18:44Z

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



All About Granite

2016-12-07T11:18:44Z

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



What Is Chemical Weathering?

2016-12-07T11:18:44Z

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



What Is the Most Common Mineral on Earth?

2016-12-07T11:18:44Z

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



Fault Types with Diagrams

2016-12-07T11:18:44Z

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



6 Things to Know About the Earth's Mantle

2016-12-07T11:18:44Z

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



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

2016-12-07T11:18:44Z

The granites of geology and commerce are quite different.



How to Tell the Feldspar Minerals Apart

2016-12-07T11:18:44Z

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



Where to Look for Rocks and Minerals

2016-12-07T11:18:44Z

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



How to Look at a Rock Like a Geologist

2016-12-07T11:18:44Z

Notes on the most basic operation in geology.



What Is My Yellow Mineral?

2016-12-07T11:18:44Z

A guide to the most common and significant yellow minerals.



Everything You Need to Know About the Lithosphere

2016-12-07T11:18:44Z

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



The Story of Basalt

2016-12-07T11:18:44Z

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



Magma and Lava - How It Melts, Rises, and Evolves

2016-12-07T11:18:44Z

About the molten stuff from which all rocks arise.



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

2016-12-07T11:18:44Z

Quartz is essential to the land as we know it.



Plate Tectonics Explains How the Earth's...

2016-12-07T11:18:44Z

Start here to learn the basics of plate tectonics.



Exfoliation

2016-12-07T11:18:44Z

How big rock domes peel off in shells. Page 6.



How Volcanoes Caused the Great Dying: The...

2016-12-07T11:18:44Z

The greatest mass extinction of the last 500 million years or Phanerozoic Eon happened 250 million years ago, ending the Permian Period and beginning the Triassic Period.



Phyllite

2016-12-07T11:18:44Z

Phyllite is a major metamorphic rock type from regional metamorphism. Page 13.



Earthquakes - The Basics in a Nutshell

2016-12-07T11:18:44Z

Start here for the seismic basics: faults that cause earthquakes, types of seismic waves, damages they cause and more.



Igneous Rock Types

2016-12-07T11:18:44Z

The major igneous rock types, plutonic, intrusive and extrusive.



Metamorphic Rock Types

2016-12-07T11:18:44Z

The major metamorphic rock types, from regional, contact and mechanical metamorphism.



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

2016-12-07T11:18:44Z

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



Measuring Plate Motion

2016-12-07T11:18:44Z

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



Where Are the Greatest Earthquake Threats in...

2016-12-07T11:18:44Z

The United Nations' global map of seismic hazard



What's the Difference Between Geology,...

2016-12-07T11:18:44Z

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



Schist

2016-12-07T11:18:44Z

Schist is a major metamorphic rock type from regional metamorphism. Page 15.



More Than 50 Different Landforms in Pictures

2016-12-07T11:18:44Z

Find and see geological landforms at About.com Geology.



Plutonic Rocks - Definition and Examples

2016-12-07T11:18:44Z

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



Mineral Pictures A to Z

2016-12-07T11:18:44Z

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



Serpentinite

2016-12-07T11:18:44Z

Serpentinite is a major metamorphic rock type from regional metamorphism. Page 16.



Granite

2016-12-07T11:18:44Z

Granite is one of the major igneous rock types. Page 8.



Shale

2016-12-07T11:18:44Z

Shale is one of the major types of sedimentary rocks. Page 23.



Granodiorite

2016-12-07T11:18:44Z

Granodiorite is one of the major igneous rock types. Page 9.



Scoria

2016-12-07T11:18:44Z

Scoria is one of the major igneous rock types. Page 22.



Geologic Gift Guide: Best Places to Find Gifts...

2016-12-07T11:18:44Z

Find the best gifts for geologists or geology hobbyists with this comprehensive gift guide. The geologist in your life will thank you.



Gneiss

2016-12-07T11:18:44Z

Gneiss is a major metamorphic rock type from regional metamorphism. Page 6.



Sedimentary Rock Types

2016-12-07T11:18:44Z

The major types of sedimentary rocks.



Here are the Sizes of Tectonic or Lithospheric...

2016-12-07T11:18:44Z

Here is a table listing the lithosphere's tectonic plates by order of size. The lithosphere is the brittle outer layer of the solid Earth.



Basalt

2016-12-07T11:18:44Z

Basalt is one of the major igneous rock types. Page 3.



Siltstone

2016-12-07T11:18:44Z

Siltstone is one of the major types of sedimentary rocks. Page 24.



Quick Sediment Testing: Particle Size

2016-12-07T11:18:44Z

A simple procedure for analyzing the grain-size composition of sediment.



The Scientific Definition of a Mineral

2016-12-07T11:18:44Z

Minerals meet four criteria, more or less strict.



Quartzite

2016-12-07T11:18:44Z

Quartzite is a major metamorphic rock type from regional metamorphism. Page 14.



What Is Geology?

2016-12-07T11:18:44Z

The whole of Earth sciences, compressed to a nutshell.



Greenstone

2016-12-07T11:18:44Z

Grenstone is a major metamorphic rock type from regional metamorphism. Page 8.



Rock Cycle Diagram

2016-12-07T11:18:44Z

The rock cycle as I see it. Geology.



What Counts as a Rock to a Geologist?

2016-12-07T11:18:44Z

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



Slate

2016-12-07T11:18:44Z

Slate is a major metamorphic rock type from regional metamorphism. Page 17.



Mechanical Weathering

2016-12-07T11:18:44Z

A short explanation of mechanical weathering.



What You Should Know About the San Andreas Fault

2016-12-07T11:18:44Z

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



Syenite

2016-12-07T11:18:44Z

Syenite is one of the major igneous rock types. Page 23.



Travertine

2016-12-07T11:18:44Z

Travertine is one of the major types of sedimentary rocks. Page 25.



Metamorphic Fabrics

2016-12-07T11:18:44Z

The six basic fabric types found in metamorphic rocks.



Felsite

2016-12-07T11:18:44Z

Felsite is one of the major igneous rock types. Page 6.



Pegmatite

2016-12-07T11:18:44Z

Pegmatite is one of the major igneous rock types. Page 14.



Minerals with Metallic Luster

2016-12-07T11:18:44Z

Minerals with metallic luster are easy to learn to identify.



Peridotite

2016-12-07T11:18:44Z

Peridotite is one of the major igneous rock types. Page 15.



The Great Cascadia Earthquake of 2xxx

2016-12-07T11:18:44Z

Cascadia is America's tectonic version of Sumatra, where the great quake of 2004 occurred.



Volcanism in a Nutshell

2016-12-07T11:18:44Z

Volcanism is more than volcanoes: it's what recycles the Earth's crust.



Fossil Picture Gallery

2016-12-07T11:18:44Z

Pictures of fossils, part of the About.com Geology gallery of images.



Steno Started Geology with a Few Simple...

2016-12-07T11:18:44Z

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



Diorite

2016-12-07T11:18:44Z

Diorite is one of the major igneous rock types. Page 4.



The Hayward Fault of California

2016-12-07T11:18:44Z

The Hayward fault may be America's greatest impending earthquake disaster.



Arkose

2016-12-07T11:18:44Z

Arkose is one of the major types of sedimentary rocks. Page 2.



Komatiite

2016-12-07T11:18:44Z

Komatiite is a rare and ancient ultramafic lava. Page 11.



Pyroxenite

2016-12-07T11:18:44Z

Pyroxenite is one of the major igneous rock types. Page 19.



What Is an Ophiolite?

2016-12-07T11:18:44Z

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



Obsidian

2016-12-07T11:18:44Z

Obsidian is one of the major igneous rock types. Page 13.



Tonalite

2016-12-07T11:18:44Z

Tonalite is a felsic plutonic rock without alkali feldspar. Page 24.



Before You Buy a Rock Collection

2016-12-07T11:18:44Z

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



Fossils: What They Are, How They Form, How They...

2016-12-07T11:18:44Z

Fossils are precious gifts from the geologic past: signs and remains of ancient living things preserved in the Earth's crust.



Translate Names Between Gemstones and Minerals

2016-12-07T11:18:44Z

Big list of mineral names and their corresponding gemstone names.



Gabbro

2016-12-07T11:18:44Z

Gabbro is one of the major igneous rock types. Page 7.



A Detailed Map of Tectonic Plate Boundaries

2016-12-07T11:18:44Z

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



Marble

2016-12-07T11:18:44Z

Marble is a major metamorphic rock type from regional metamorphism. Page 10.



Rhyolite

2016-12-07T11:18:44Z

Rhyolite is one of the major igneous rock types. Page 21.



How to Tell Apart the Granitoid Rocks

2016-12-07T11:18:44Z

How geologists sort out granite from the rocks that look like it.



Uranium-Lead Dating

2016-12-07T11:18:44Z

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



Volcanic (Extrusive) Rock Types

2016-12-07T11:18:44Z

Photos of the types of erupted igneous rocks.



Quartz Monzonite

2016-12-07T11:18:44Z

Quartz monzonite is one of the major igneous rock types. Page 20.



Subduction: The Sinking of Tectonic Plates

2016-12-07T11:18:44Z

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



Chert

2016-12-07T11:18:44Z

Chert is one of the major types of sedimentary rocks. Page 7.



Perlite

2016-12-07T11:18:44Z

Perlite is one of the major igneous rock types. Page 16.



Claystone

2016-12-07T11:18:44Z

Claystone is a type of sedimentary rock. Page 8.