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Trilobites are GREAT!!!😃👍💛💛💛💛💛 I think some may still be alive in caverns deep below ground somewhere. I hope they can be rediscovered someday just like the coeliocanth!!!😃👍💛💛💛💛💛💛💛💛

More carbon, more trees????????????? Green houses use carbon to grow faster??????????? Anyone???????????

Detail. We don't need the agreement of every human on Earth to fight climate change. We just need to have rulers and lawmakers willing to do it. They can pressure CEOs and make companies to change. Therefore, talk to and educate everybody in your reach. *Then, go and vote accordingly.* The remaining people who never understood climate change will be saved unknowingly, same as when they never knew what the fuss about CFCs was about.

Excellent summary! - I had to learn this 50 years ago.

our sand in the west especially the southwest is aolian sand quartz type with a thin coating of iron oxide on the outside giving the reddish color. The various cream or white layers in the same sand are because of reducing fluids that bleach out the iron into solution and concretions are formed from it redepositing the iron if exposed to oxygenated surface water. WHY cannot I take our reddish sand and bleach it white with vinegar or sulfuric acid??

Rachel, I'm curious about your procedure for producing these videos. Do you write a script? Or do you just make the slide show and use them as an outline, but talk off the top of your head? Do you make many mistakes while you're talking that require you to cut and edit your video? Or do you do it all in one take?

The big competition for dinosaurs that went extinct because of this disaster WEREN’T therapsids but croc-line archosaurs. Additionally, dinosaurs were actually poorly suited to handling hot, arid climates compared to other archosaurs-if anything it’s their ability to handle very COLD temperatures (so the OPPOSITE of what’s usually claimed in most discussions) caused by volcanic winters that allowed them to make it.

Please show what geology textbook you are using as a basic source. Thank you.

The rate of change in our understanding of the earth and life on it is very positive thanks to Geo Girl! ❤🎉😊

Hearty thanks to Geo Girl for authoritatively walking us lay persons through how our increased carbon dioxide and methane emissions have caused rapid global warming, accelerating extinctions of plants and animals, and ocean acidification. So great to hear a voice of reason when the Heartland Institute keeps putting out false propaganda and denies human caused climate change! As a father of two, I am truly grateful for this accurate information to support a better climate for young people in the future!

Outstanding work on this lecture! I agree pegmatitic🥇 For me it's the purple lepidolite of the Harding mine NM

Need a collab between you and @AskJeffWilliams!

Please can we have a video on this for Europe

Interesting that you don't cover the nuclear tests. Why? Is documented that nuclear test increased dramatically C14 isotope globally and the half life of C14 is 5,730 years. Start to decrease, apparently after 1963. "At first, in the 1950s only a few tests were done, but as more, and larger tests were done, scientists realized how dangerous this was. This caused the nuclear powers to sign a Nuclear Test Ban Treaty, which went into effect in October 1963." Only USSR tested over 400 atomic bombs during cold war(Tsar Bomba 58 megatons) "Nuclear testing at Bikini Atoll consisted of the detonation of 24 nuclear weapons by the United States between 1946 and 1958 on Bikini Atoll in the Marshall Islands." God knows how many more was tested by US in other parts of the globe. Even after 1963 Treaty other countries tested nuclear bombs for example 6 by Pakistan and 5 by India . Besides nuclear test we have contaminants from nuclear energy incidents and residues Three Mile Island 1979 US, Chernobyl 1986, Fukushima 2011 and many others which was shoved silently under the carpet. Here comes also Strontium Isotopes 89 with half life of 50 years and Strontium 90 with half life of 28 years. You look at the burning fossil and air pockets in the ice and ignore nuclear chaos, well done. High increase of C12 and C13 is increased by agriculture. Plowing alone will release a huge amount C into the atmosphere and will make the soil to lose nutrients slowly growing into desert.

Hi, just wanted to say that this video is super helpful! I'm not planning on being a geologist myself sadly, but I *am* planning on being a writer, and this video has a lot of useful information to help me with a project I'm working on at the moment. Thank you so much!