I am pretty sure that the answer is remote sensing.
There re different kinds of rocks. Compared to continental rocks, some of which are more than 4 billion years old, the rocks of the ocean floor are <u>extremely </u>young.
<h3>What rocks are found on the ocean floor?</h3>
The rocks of the ocean floor are known to be mid-oceanic ridge basalts, that is formed from low-potassium tholeiitic magmas.
Basalt is known to be the most common rock of volcanic rock that is found on the sea floor. The Rocks from the sea floor is said to be not the same from those seen on land as a result of their shape and chemical composition
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Explanation:
The basis of the scientist in dividing the Earth's lithosphere into several segments called plates is the distribution of earthquake epicenters, location of volcanoes, and formation of mountain ranges. ... Majority of them are situated along plate boundaries.
In contrast, secondary source is information that one that was created later by someone who did not experience first hand.