<https://secure.gravatar.com/avatar/06ee4420a05814f421c5ae8f23428160?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://cosmosmagazine.com/space/plate-tectonics-and-the-search-for-life/>