The rocks near the mid-ocean ridge were younger then rock near trenches. Matching bands of magnetic rocks were found on either side of the mid-ocean ridge; bands like tree ring - record changes in earths magnetic field over time. Earthquake data showed oceanic crust is sinking on to the mantle at trenches.

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An atom that has an outer shell that is NOT full is (more likely OR less likely) to be reactive than an atom that has a full out

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Answer:

A half filled orbital is LESS LIKELY to be reactive than a fully filled orbital

Explanation: A fully filled orbital has the electronic configuration of a noble gas. That is, unreactive.

The quantum states of these orbitals(fully filled) are stable because the electrons in the sub shell are fully filled which makes it difficult for it to loose and gain electron unlike a half filled which is much more easier. It will take more energy for ionization to take place making it(fully filled) more stable.

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