THERE IS DESERT AND DESERT

In geography, desert is defined as an area of the earth’s surface in which the precipitations are unlikely to exceed 250 millimeters per year, and the soil is mostly arid, with little or no vegetation. Among the deserts, according to this definition, must also be considered Polar Regions, in addition…

Leggi

TRILOBITES

Trilobiti

Trilobites are a group of marine arthropods of small and medium-sized, lived during the Paleozoic Era disappeared completely at the end of the Permian, about 230 million years ago, although their mass extinction occurred at the end of the Devonian.     Trilobites are found in marine deposits of a…

Leggi

NEITHER FISH NOR FOWL

Bull shark – Carcharias taurus (Rafinesque, 1810) It’s easy to say fish, but in scientific language that term is improper. The so-called “fish” actually fall into two distinct classes, the Chondrichthyes and Osteichthyes. So to speak, the same phylogenetic distance that exists between the class of Amphibians with the class…

Leggi

WINGS OR FINS?

Humboldt penguin (Spheniscus humboldti, Franz Meyen 1834) is mainly spread along the coast of Peru and Chile in the Pacific Ocean. Their ability to fly, like that of all other species of existing penguins dates back to millions of years ago, and has been lost over the years, according to…

Leggi

THE CIUICI’ – Coal tit

Coal Tit (Periparus ater [Linneus 1758] or Parus ater) We could not miss the presentation of our group symbol: the Ciuicì (Coal tit). The Coal tit, symbol of Valle Brembana (BG – Italy), until a few years ago was considered the Bergamo houses canary with is characteristic singing, which explains…

Leggi

SALT or HALITE

Group III – Aloidi NaCl Very common The Rock Salt or Halite occurs in cubic crystals often “hopper” and with rounded corners, usually colorless or white, sometime yellow, red, brown and even blacks; more rarely patchy irregular blue and purple; predominantly cubes and in massive sedimentary beds, but also granular,…

Leggi