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#geology

43 posts39 participants3 posts today
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evan

So my kid getting into #rockhounding means that I'm starting to look at getting a rock #tumbler, and thinking I might #DIY with junk I've got around. But the search results that I'm finding with DDG are all either videos, very incomplete instructions, or clearly AI generated.

So if you've built one or just have one, what advice do you have? How fast should it rotate? Can I get away with a 36oz peanut butter jar for the drum? Can I really use sand instead of buying special grit?

#geology
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💧🌏 Greg Cocks

NASA Flights Map Critical Minerals From Skies Above Western US - Technology Used To Chart Other Worlds Is Revealing Minerals In The American West That Are Critical To The Country’s Renewable Energy Future.
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science.nasa.gov/earth/nasa-fl <-- shared technical article
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popo.jpl.nasa.gov/mmgis-aviris <-- shared GEMx data collection portal
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#GIS #spatial #mapping #remotesensing #earthobservation #mineral #mineralogy #mining #criticalminerals #USWest #renewableenergy #lithium #GEMx #fedscience #cost #economics #USGS #NASA #GeologicalEarthMappingExperiment #lithium #aluminum #rareearthelements #neodymium #cerium #nationalsecurity #cleanenergy #batteries #smartphones #cellphones #naturalresources #steel #steelmill #dependency #localsources #importing #survey #geology #geologicmapping #exploration #spectrometers #hyperspectral #EMIT #mine #extraction #EarthMRI #opendata
@USGS @nasa

Continued thread
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Ian Kluft ✈️🎈🌋

With the federal gov't chaos, it's no surprise that US Forest Service's page on the Spirit Lake Tunnel Replacement project changed to return 404 Not Found. Some info remains at another page - but archived presentation slide links there are broken too. So the project appears in limbo or dead, which should be of concern to downstream areas. A collapse of the debris dam at Spirit Lake would inundate the same areas hit by Mt St Helens 1980 lahar/mudflow. fs.usda.gov/r06/giffordpinchot #volcano #geology

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Ian Kluft ✈️🎈🌋

"US Forest Service eyes updating or even replacing Spirit Lake tunnel" by The Columbian (Vancouver WA, northern Portland metro area) - Pacific Northwest #PNW is still dealing with Mt St Helens 1980 eruption 45 years later. A 1985 tunnel needs replacement for outflow of Spirit Lake. It prevents overtop & collapse of natural dam of 1980 eruption debris, which would inundate the Toutle & Cowlitz Rivers, cities of Longview & Kelso, I-5 and mainline railroad. columbian.com/news/2025/apr/08 #volcano #geology

The Columbian · U.S. Forest Service eyes updating or even replacing Spirit Lake tunnelBy Henry Brannan
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Chris Rowan

So here's a slightly esoteric question for the #geology folk: when did you first learn about the method of multiple working hypotheses?

I ask because *I* first encountered it when I started teaching in the US, where it was treated as this bedrock concept - and I was all ‘huh?’

The thing I remember being emphasised as an UG was the important of separating observations from interpretations, which seems to come from a similar place; but that was as far as it went.

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