When light from a flashlight is moved quickly back and forth on a wall in a darkened room, it can appear to observers that there is a trail of light moving across the wall, even though physically the light is only in one place at any given time. This experience is an effect of memory that occurs because of

This experience is an effect of memory that occurs because of iconic memory.

Explanation:

Iconic memory is a part of visual memory that lasts only for milliseconds. Everybody has experienced an example of iconic memory in their lives. For instance, when we turn off the lights and still have an a quick memory of what the room looked like when the lights were on. Or when we stare at our phones and then close our eyes, but can still "see" the phone screen from a moment ago. That is the same explanation for the appearance of a trail of light when the light is physically only in one place. Our brain can still "see" where the light was, before that iconic memory fades.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place