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6400 Geology

Geology

Dig deeper into geology by learning about everything from ancient fossils and rock formation, to present-day landslides and earthquakes.

  • Laguna agate from Mexico
    Alphabetical List of Precious and Semiprecious Gemstones
  • Old faithful geyser erupting with sunset in the background
    How Geysers Work
  • A piece of amber
    Guide to Identifying Yellow Minerals
  • This rock contains a large percentage of chlorite, exhibiting its typical green color
    9 Common Green Rocks and Minerals
  • Augite
    Identifying Black Minerals and Rocks
  • Young girl studying a collection of gems and minerals using a magnifying glass and brush to collect information
    10 Steps for Easy Mineral Identification
  • Age of the cceanic lithosphere
    The Age of the Ocean Floor
  • Danakil Depression
    The Danakil Depression: The Hottest Place on Earth
  • Internal structure of the Earth includes the crust, mantle, and core
    6 Fascinating Facts About the Earth's Mantle
  • Rose quartz pieces close up.
    How to Identify 11 Red and Pink Minerals
  • concordia diagram
    Uranium-Lead Dating
  • Close-Up Of Rocks At Beach
    11 Different Types of Holes in Rocks
  • birth of the solar system
    The Birth of Earth
  • Julian Alps, Slovenia
    Orogeny: How Mountains Form Through Plate Tectonics
  • Close-Up Of Crystal Rock
    What Are Minerals?
  • MIT building. The domed building on the Massachusetts Institute of Technology on campus.
    Top 25 U.S. Colleges for a Geology Ph.D.
  • Rock Formations
    What Is Biological or Organic Weathering of Rocks?
  • Tonalite, holocrystalline magmatic rock
    All About Plutonic Rocks
  • Geology students interpret a rock found below the rim of North Caineville Mesa, Utah.
    Geology, Earth Science and Geoscience: What's the Difference?
  • Mountain range and valley of Sibebe Rock, Swaziland
    What Is a Pluton?
  • rock hammer next to rock
    How to Use a Rock Hammer Safely
  • Amethyst mineral close up.
    The 12 Most Common Violet, Purple, and Blue Minerals
  • That fossilized shells of two ammonites, extinct sea creatures that are millions of years old
    How to Abbreviate Millions of Years Old
  • texture - gravel & sand
    Quick Sediment Testing: Particle Size
  • fossils up close
    Fossils: What They Are, How They Form, How They Survive
  • River in Lopez Mountain at San Carlos de Bariloche, Patagonia, Argentina, South America
    Mechanical Weathering Through Physical Processes
  • rhodochrosite
    Definition and Examples of Mineral Habits
  • Old bones in a dirt landscape.
    How Index Fossils Help Define Geologic Time
  • Plagioclase
    Gallery of Feldspars
  • A fossil Nautilus shell
    A Fossil Picture Gallery
  • Scientist Using Furnace for Dating Process
    Potassium-Argon Dating Methods
  • large, intrusive dike
    What Are Dikes and How Do They Form?
  • Providence Canyon, Georgia.
    What Is Erosion and How Does It Shape the Earth's Surface?
  • Dramatic Pa-Hoe-Hoe basalt lava field in Kalapana, Hawaii
    The Pyroxene Minerals
  • Apatite
    Guide to Phosphate Minerals
  • Closeup of big gold nugget
    The Bre-X Gold Scandal
  • Businessman in Train With Cell Phone, Headphones and Tablet
    8 Best Geology Apps for iPhones, iPads and Androids
  • Fault slickensides
    Gallery of Slickensides
  • Shale, close up
    How to Distinguish Brown Minerals
  • Looking down
    Geological Thinking: Method of Multiple Working Hypotheses
  • Fossilized shark tooth
    Geologic Time Scale: Eons, Eras, and Periods
  • Quartz crystal
    What Is the Most Common Mineral?
  • Oxidation turns this peridotite to different tones of red
    What Is Chemical Weathering?
  • Megalodon skark tooth
    A Visit to Sharktooth Hill
  • A satellite image reveals the topography of Zealandia, underlying the archipelago of New Zealand, the South Pacific, New Caledonia and surrounding islands
    Zealandia: The Drowned Continent of the South
  • Sand-Silt-Clay Classification Diagram
    Sand, Silt, and Clay Soil Classification Diagram
  • bricks and mortar
    The Geology of Bricks
  • Detail of pink granite bowling on rock
    The Bowen Reaction Series in Geology
  • Close of of several rocks.
    All About Sediment Grain Size
  • The classic acid test
    What Is the Acid Test in Geology?
  • Ocean trench
    Exploring Deep-ocean Trenches
  • Close up of a rope fraying under the strain of being pulled
    What is Geological Strain?
  • Assortment of shiny metallic objects such as lamps and goblets.
    10 Shiny Minerals With Metallic Luster
  • Colorado Plateau, Bryce
    Epeirogeny: Understanding Vertical Continental Drift
  • Blue handled geologist hammer with two cylinder rocks
    Picking the Right Rock Hammer
  • Galena
    Examples of Different Mineral Lusters
  • Statue of Niels Steno
    Steno's Laws or Principles
  • Lumps of coal
    Coal in the Home
  • Jeweler inspecting gemstone with loupe
    Before You Buy a Magnifier
  • Limestone, thin section, polarised LM
    Carbonate Compensation Depth (CCD)
  • Mount Roraima, the border between Venezuela, Guyana and Brazil.
    A Look at South American Geology
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