What does finding igneous rock on the ocean floor tell us

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Basaltic Rocks
Basaltic Rocks

The top layer of the sea floor is primarily composed of about 50 % basalt, which is the most common type of volcanic rock to be erupted.
Both igneous and sedimentary rock types can transform physically and chemically into a third rock type. Metamorphic rocks are formed when igneous or sedimentary ... Basalt
Granite is a common intrusive rock in continents. If magma with the same composition reaches the surface, it forms extrusive rocks such as rhyolite and pumice (PUHM-ihs). Basalt (buh-SAWLT) is an extrusive igneous rock that forms the ocean floor. Gabbro is an intru- sive rock that has the same composition as basalt.

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Given standard reduction potentials E° (volts): Na+ + e– --> Na –2.71 Al3+ + 3e– --> Al –1.66 Fe2+ + 2e– --> Fe –0.44 C

Mariana [72]

Explanation:

According to the electrochemical series, more positive is the $E_{o}$ value then more will be tendency of the oxidized form to get reduced by accepting electrons.

Similarly, more negative is the value of $E_{o}$ then more will be tendency of the reduced form to get oxidized by donating electrons.

In the given situation, $Fe^{2+} + 2e^{-} \rightarrow Fe$ , $E^{o}_{cell}$ = -0.44

Therefore, we can conclude that metal which spontaneously gets reduced by iron metal is $Cu^{+}$ and Ag as these have positive $E^{o}_{cell}$ values.