Younger oceanic crust will have ocean sediments, while older oceanic crust will have oceanic sediments.

Younger oceanic crust will have thinner oceanic sediments because it would have not had enough time to form. As a result they are not so thick and deep yet. On the other hand, older oceanic crust will have thicker oceanic sediments or more sediment covering it. So thickness of oceanic sediments work as a geological clock. 

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!