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.
Tennessee Weather in April 2018 (Memphis) Tennessee in April Tennessee weather in April is pleasant with nice evenings, as temperatures are between 12.9Â° and 22.4Â° degrees. Since there are on average 17 rainy days in Tennessee in April and chances for rain are high, it is recommended to take an umbrella with you. Either way, it is recommended to check the exact weather forecast for Tennessee before arriving, as the weather forecast becomes more accurate closer to the checked date.