• Effects of Experimental Freeze-Thaw and Wet-Dry Weathering Cycles on Fluvial Abrasion Rates

    Updated: 2024-07-30 14:39:12
    Home Search Browse Collections My Account About Digital Commons Network™ Skip to main content CEDAR Home About Western Libraries FAQ My Account Western CEDAR Previous Next Home WWU Graduate and Undergraduate Scholarship Honors Projects 857 WWU Honors College Senior Projects Effects of Experimental Freeze-Thaw and Wet-Dry Weathering Cycles on Fluvial Abrasion Rates Authors Finn Coffin Senior Project Advisor Allison Pfeiffer Document Type Project Publication Date Spring 2024 Keywords Geomorphology , geology , fluvial , abrasion , weathering , freeze-thaw , wet-dry , mass wasting Abstract How do rocks break down as they work their way downstream This study focuses on weathering and abrasion processes of volcanic mass wasting deposits in rivers of the Pacific Northwest . Implications include

  • A blue miracle: How sapphires formed in volcanoes

    Updated: 2024-07-29 21:34:33
    Sapphires are among the most precious gems, yet they consist solely of chemically 'contaminated' aluminum oxide, or corundum. It is widely assumed that these crystals with their characteristically blue color come from deep crustal rocks and accidentally ended up on the Earth's surface as magma ascended. Geoscientists have now been able to show that the sapphire grains found in the Eifel (Germany) formed in association with volcanism.

  • New study supports stable mantle chemistry dating back to Earth's early geologic history and over its prodigious evolution

    Updated: 2024-07-24 04:30:16
    A new analysis of rocks thought to be at least 2.5 billion years old helps clarify the chemical history of Earth's mantle -- the geologic layer beneath the planet's crust. The findings hone scientists' understanding of Earth's earliest geologic processes, and they provide new evidence in a decades-long scientific debate about the geologic history of Earth. Specifically, the results provide evidence that the oxidation state of the vast majority of Earth's mantle has remained stable through geologic time and has not undergone major transitions, contrary to what has been suggested previously by other researchers.

  • Hot traces in rock

    Updated: 2024-07-23 04:33:38
    Fluids circulating underground change rocks over the course of time. These processes must be taken into account if they are to be used as a climate archive. Researchers have used 380-million-year-old limestones from Hagen-Hohenlimburg to show in detail which climate information is still preserved in the rock.

  • Scientists discover missing piece in climate models

    Updated: 2024-07-15 17:57:57
    As the planet continues to warm due to human-driven climate change, accurate computer climate models will be key in helping illuminate exactly how the climate will continue to be altered in the years ahead.

  • Building materials for water-rich planets in the early solar system

    Updated: 2024-07-09 04:18:17
    Age data for certain classes of meteorite have made it possible to gain new findings on the origin of small water-rich astronomical bodies in the early solar system. These planetesimals continually supplied building materials for planets -- also for the Earth, whose original material contained little water. The Earth received its actual water through planetesimals, which emerged at low temperatures in the outer solar system, as shown by computational models carried out by an international research teach with participation by earth scientists.

  • Getting a good look at what’s out there

    Updated: 2024-07-05 14:30:00
    From taking hundreds of thousands of photos of Mars to scanning the skies for asteroids, humanity is keeping an eye on our cosmic neighborhood.

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