Did a second killer asteroid finish the dinosaurs off? Crater in West Africa hints yes.
Did a second killer asteroid finish the dinosaurs off? Crater in West …
Aug 18, 2022
SPACE.comStephanie Pappas
K–Pg extinction (Cretaceous –Paleogene extinction) হলো পৃথিবীর ইতিহাসে অন্যতম বৃহৎ গণবিলুপ্তি, যা প্রায় ৬৬ মিলিয়ন বছর আগে ঘটেছিল। পৃথিবীতে একটি বিশাল গ্রহাণু (asteroid) আঘাত হানে—আজকের মেক্সিকোর চিক্সুলুব (Chicxulub) ক্রেটার সেই আঘাতের চিহ্ন। আঘাতের ফলে বিশাল আগুন, ধুলো-মেঘ ও অ্যারোসোল বায়ুমণ্ডল ঢেকে ফেলে সূর্যালোককে বাধা দেয়। পৃথিবীর জলবায়ু হঠাৎ অত্যন্ত ঠান্ডা হয়ে যায় এবং খাদ্যচক্র ভেঙে পড়ে। পৃথিবীর প্রায় ৭৫% প্রজাতি বিলুপ্ত হয়। নন-এভিয়ান ডাইনোসররা পুরোপুরি বিলুপ্ত। বহু সামুদ্রিক প্রাণী—যেমন অ্
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K–Pg extinction (Cretaceous –Paleogene extinction) হলো পৃথ…
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FacebookWisilife - ওয়াইজিলাইফ
The end Cretaceous asteroid impact released an extraordinary amount of energy, with scientific estimates on the order of tens of millions to about one hundred million megatons of TNT. The collision generated massive tsunamis and lofted vast quantities of dust and sulfur bearing material high into the atmosphere, while global wildfires added soot. Climate models show that this combination sharply reduced sunlight, shut down photosynthesis, and drove severe global cooling for months to years, coll
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The end Cretaceous asteroid impact released an extraordinary amount …
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End-Cretaceous asteroid caused massive global tsunami, peaking at a mile high
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