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.
Poland is situated in a moderate climate zone. In summer (July) â the temperature varies from 25Â° to 35Â° Celsius. The coldest months are January and February with temperatures falling a couple of degrees below zero. In the mountains, the weather conditions for winter sports are generally good. Poland has as many as six distinct seasons. Apart from the four typical European seasons, there are also two periods described as early spring (przedwiosnie) and early winter (przedzimie). The seasons hardly conform to the calendar pattern.