How many different disciplines had to come together before the full understanding of the theory of plate tectonics could be realized?

Six disciplines, they are:  Paleomagnetics, Seismology, Oceanography, Structural geology, Geography and Paleontology.

Explanation:

Tectonic plates are large blocks that form part of the outer solid layer of planet Earth, responsible for supporting oceans and continents. As the Earth's magma moves within it, the main plates push the others, which change a few millimeters and modify parts of the Earth in parts. They are located in the Earth's layer called the lithosphere.

We know this today, thanks to the discovery that made these plates known. This discovery, along with all theories about how these plates form, move, and influence our planet, was realized thanks to the efforts and amalgamation of six different disciplines. These disciplines are:  "Paleomagnetics, Seismology, Oceanography, Structural geology, Geography and Paleontology".

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both the house and senate must approve the conference report.   after it is approved by both on an identical from, it will be sent to the president.   if the president approves it, it will become law.