Why is the youngest rock found near mid ocean ridges

At mid-ocean ridges, the seafloor is spreading as the plates move away from each other.

Harry Hess said tha thte continents move over time but not in a random drifting pattern. Instead the seafloor was spreading at the mid-ocean ridge because the plates were moving away from each other. Motion of t heseafloor in a conveyor belt fashion explains the phenomena of the youngest rocks being found only at the mid-ocean ridges, and rockes getting progressively older as you move away from the ridge.

I hope this explains :)

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes