Often, soils from cold regions, such as Arctic soils, show polygonal forms in their surface. These polygons are formed because of the freeze-thaw cycle, characteristic of permafrost. What is permafrost? Permafrost is a subsurface soil layer which stays permanently frozen (below 0 oC) during long periods of time, usually more than two consecutive years. Most extensive permafrost areas can be found ...[Read More]
Wikipedia is evil
Yesterday, I had to write the exam questions for my students of Soil Science in the Faculty of Biology. As there are many more than 300, because of the facilities that my government gives to the fulfilment of the Bologna Process and the European Higher Education Area (ironic mode activated), I usually make multiple choice tests (if you do the same, have a look at this). However, I like to put some ...[Read More]