Stained glass is thicker at the bottom - so is it a liquid? Earth's mantle enables plate tectonics, so is it a liquid? Check out Audible: http://bit.ly/AudibleVe Sign up for the mailing list:...
========== In 1994, a massive earthquake shook the Northridge suburb of Los Angeles, killing 57people and injuring over 5000. The cost of damages was in excess of $20 billion. It'searthquakes like this one that make us question just how solid is the earth beneath ourfeet, and what does it mean to be solid anyway?At first glance, pitch looks like a solid, but it's not. It's actually a liquid at roomtemperature—just a very viscous one. Viscosity is a measure of resistance to flow—what weoften think of as the "thickness" of a liquid. Olive oil is nearly 100 times more viscousthan water, and honey is about 100 times more viscous than that. Meanwhile, pitch has aviscosity 2.3×10¹¹ times that of water. At the university of Queensland in...