Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.irst, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
Polk County Weather. The average temperature of Polk County is 72.96Â°F, which is higher than the Florida average temperature of 71.80Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #14.
Averages for Florida in September What's the Weather like in Florida in September. Temperature September is the last true summer month in Florida, The Sunshine State. That being said, however; the state's gorgeous climate makes it a spectacularly warm and sunny place to visit all year round. In September, the average temperature is 27Â°C, which is only one degree below the annual maximum of 28Â°C in July and August. June is equally as warm.