Barrier islands are coastal landforms and a type of dune system that are exceptionally flat or lumpy areas of sand that form by wave and tidal action parallel to the mainland coast. They usually occur in chains, consisting of anything from a few islands to more than a dozen.
Russia's eastern to western border is 6,666 miles.
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Answer: event horizon </h2><h2>
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The event horizon is the <u>surface of a black hole</u>, it is the border of space-time in which the events on one side of it can not affect an observer on the other side.
That is, at this border also called "point of no return", nothing can escape (not even light) and no event that occurs within it can be seen from outside.
In this sense, on April, 10th 2019 this was demonstrated with the publication of the image, for the first time, of the event horizon of the black hole (which appeared as an orange glow ) in the M87 galaxy. This is the first time in human history a picture of a black hole is taken.
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I believe the correct answer among the choices listed above is the first option. Glaciers has shaped much of the landscape along the North European Plain. This part of Europe includes Poland, Germany and Netherlands.