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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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Preparedness and Phobias
Human fear responses to certain stimuli, such as darkness, heights, deep water, and blood, can often arise despite the absence of direct negative experiences. This phenomenon is rooted in evolutionary psychology, which posits that humans have developed a predisposition to fear stimuli that historically posed significant survival threats. This predisposition, known as preparedness, suggests that early humans who developed a fear of potentially dangerous entities, such as venomous snakes and...
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Updated: Jun 13, 2026

07:58
Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
Prepare for Cascadia's next earthquake
Ben A Leshchinsky1, Adam M Booth2, Kira M Glover-Cutter3
1College of Forestry, Oregon State University, Corvallis, OR 97331, USA. ben.leshchinsky@oregonstate.edu.
Summary
No abstract available in PubMed .

