Earthquakes result from the sudden shaking of the Earth, which is produced by the constant movement of tectonic plates in the Earth's crust. Most earthquakes occur along oceanic and continental plate limits.
A little while ago, my sister approached me with an idea. She's doing an education degree, and her and her friends had to give a series of lessons on the geological sciences to a class of primary school kids. One of their lessons involved teaching the kids about the structure of the Earth. One of her friends came up with the idea of presenting a model of the Earth made out of cake. So my sister asked me if I could make a spherical cake with all the layers of the Earth inside it.
I told her I couldn't do it. "How do you get a sphere inside a sphere inside a sphere?" I recall saying. "Oh yeah," she replied, realising what it would involve.
I spent the rest of the afternoon thinking about it. I don't admit defeat. Ever. But especially not with cake. Nothing is impossible is pretty much my baking motto, so to say this cake was impossible left me feeling weird. There had to be a way. A way that didn't involve carving or crumbing the cake. I kept mulling it over until I had a breakthrough.
There was a better way of doing this that I came up with, but I needed a set of hemisphere tins to pull it off. I didn't have the equipment, nor the funds to purchase it, so I had to come up with a plan B. Somehow I went from "it's impossible" to having multiple ideas. Go figure.
Plan B involved baking a cake inside a cake inside a cake. And crossing all fingers and toes and hoping it worked.
"One of their lessons [in a series involving geologic sciences] involved teaching the kids about the structure of the Earth. One of her friends came up with the idea of presenting a model of the Earth made out of cake. So my sister asked me if I could make a spherical cake with all the layers of the Earth inside it."
The Earth's magnetic field has reversed many times at an irregular rate throughout its history. Long periods without reversal have been interspersed with eras of frequent reversals. What is the reason for these reversals and their irregularity? Researchers from CNRS and the Institut de Physique du Globe, France, have shed new light on the issue by demonstrating that, over the last 300 million years, reversal frequency has depended on the distribution of tectonic plates on the surface of the globe. This result does not imply that terrestrial plates themselves trigger the switch over of the magnetic field. Instead, it establishes that although the reversal phenomenon takes place, in fine, within the Earth's liquid core, it is nevertheless sensitive to what happens outside the core and more specifically in the Earth's mantle. This work is published on 16 October 2011 in Geophysical Research Letters.
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