Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.he destruction of oceanic crust occurs at subduction zones where oceanic crust is forced under either continental crust or oceanic crust. Today, the Atlantic basin is actively spreading at the Mid-Atlantic Ridge. Only a small portion of the oceanic crust produced in the Atlantic is subducted.
April sees the weather continue to improve in Krakow, Poland, as the average temperature doubles to 8 C. The average high is 12Â°C and the average low 3Â°C, so April is the first month of the year that does not reach freezing temperatures.t is, along with May, the least humid month of the year at 70%, and there are 11 hours of sunshine per day? making it one of the sunniest months of the year. April hosts the Easter celebrations, and these include religious ceremonies and parades, along with various events being held around the Wawel Cathedral.
Winters are cold, with average temperatures around 3 Â°C in the northwest and â8 Â°C in the northeast. The coldest month in Poland is January. Precipitation falls throughout the year, although, especially in the east, winter is drier than summer, the average annual rainfall varied from 500 to 1000 milimeter.n the Carpathians and in the Sudeten, there is an average annual rainfall of 800-1400 mm. In Pomerania and in the Lake District Masurian rainfall varies between 400 mm and 750 mm. The lowest amount of rainfall in Poland are in Wielkopolska and in Kujawy.