The change from thinking the continents are stationary to understanding that the outer layer of the earth moves slowly nearly all of the time occurred primarily because a) we began to make global observations that required recognition that the continents and oceans had not always been in their current positions b) we improved our surveying instruments significantly we got space travel and could see the motions c) we had two world wars and learned a lot from them about the oceans that explained how continents moved

The correct answer is option A) we began to make global observations that required recognition that the continents and oceans had not always been in their current positions.

Explanation:

The knowledge of the continuous movement of the Earth is based on the work of the scientists who study the movement of the continents. This process is called "plate tectonics." Earthquakes and volcanic activity are the result of that process. Scientists have discovered that the surface of the Earth is cracked. They call these pieces "tectonic plates." Up to 20 tectonic plates cover the Earth. Sometimes they hit each other and sometimes they move away from each other. Because some continents are above two plates, the continents move when the plates do.

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