EARTH HAS A COSMIC CLOCK. Earth's climate doesn't stay exactly the same forever. Over thousands to hundreds of thousands of years, Earth's orbit and orientation in space slowly change. These changes are called the Milankovitch cycles. There are three major cycles: ECCENTRICITY Earth's orbital shape changes from more circular to more elliptical over roughly 100,000 years. OBLIQUITY Earth's axial tilt varies between about 22.1° and 24.5° over roughly 41,000 years. PRECESSION Earth's rotational axis slowly wobbles like a spinning top over roughly 26,000 years. Together, these cycles change where and when sunlight is distributed across Earth, particularly at high latitudes. Over geological timescales, these orbital changes are an important factor in Earth's long-term climate variations and the timing of many glacial and interglacial periods. Think about the scale: Earth's orientation changes over tens of thousands of years... while a human lifetime is only a tiny moment on that clock. The planet isn't just traveling around the Sun. Its entire orbital geometry is slowly changing too. Which cycle surprised you most: eccentricity, obliquity, or precession?
🚀 "Es un orgullo que España, en concreto Lanzarote, sea uno de los pocos lugares donde la @esa entrena astronautas para ir a Marte. Llevamos ya un total de 15 formados"
🎧Vuelve a escuchar la entrevista a @J_MartinezFrias en @OndaCero_es
https://t.co/koqigWaNs4
New paper of Soejono et al. on whole-rock geochemistry, U-Pb dating & Hf isotopes in detrital zircons from metavolcanic-sedimentary basement units of the Western Carpathians has just appeared in Earth-Science Reviews https://t.co/pkQpknPCUZ
📣Check out great review ▶️Anti-repeaters – #earthquakes that happen in the same location but with opposite focal mechanisms – are widespread but under-recognised and likely result from fluid migration processes.@cesca_simone
🔗 https://t.co/BFGmNEThL8
@Arduq_Arabia publication on the shell midden at Nafun, south-central Oman. The 214 sites of Wadi Nafun (shell midden, rock art, collective burial, triliths and tombs) provide a unique record of human activities from the 5th millennium BCE to the 1st millennium CE @CzechAcademy
#ClimateChange 🌡️ is exceptional and caused by human greenhouse gas emissions 🏭
We’re causing #globalwarming 100 times faster than past natural changes
We are taking Earth’s 🌎 climate beyond natural limits with carbon dioxide & temperatures levels not seen for 3 million years
In this review article, P. Martinez-Garzon and @MONIFAULTS show how complex signals which precede large #earthquake mainshocks highlight a juxtaposition of diverse driving mechanisms and the important influence of boundary conditions.
#seismology
📰👇
https://t.co/Sa0UWwqYlu