A comet is a lump of rock and ice. Spacecraft have flown by comets. A comet only has a tail when it is near the sun. Most comets come from the Kuiper belt. A comet has actually been witnessed hitting a planet. Most comets have short orbital periods.
A comet is a tiny, frozen entity in the Solar System that heats up and starts to emit gases as it approaches the Sun. This process is known as outgassing. This results in an apparent atmosphere or coma, and occasionally a tail as well. These occurrences are caused by how the solar wind and solar radiation interact with the comet's nucleus.
The size of comet nuclei varies between a few hundred meters and tens of kilometers, and they are made up of loose clumps of ice, dust, and tiny rocky particles. A comet's orbit is typically very eccentric and elliptical, and its orbital period can range from a few years to possibly millions of years.
Learn more about Kuiper Belt here:
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Answer:
The European settlement in the Americas from 1500 to 1790 was most often voluntary migration.
Explanation:
Voluntary migration; is correct because the vast majority of the people from Europe that migrated to the Americas in this period migrated voluntarily, be it because of economic reasons or because of their adventuristic nature.
Internal migration; is not correct because this is a migration that happens within the borders of a country.
Interregional migration; is not correct because the migration was going only in one direction, but in several regions from multiple regions.
International migration; is not correct because the migration was limited, a lot of people from other parts of the world were not allowed to.
Forced migration; is not correct because this was not the principle used for this particular migration.
The biggest doubling time of all the regions/continents in the world has Europe.
Europe is the only continent that has almost 0% population growth (as of 2014), which practically means that with this pace Europe will need an eternity to be able to double its population, so it makes it the continent with the biggest time needed to double it's population.
The cause was a earthquake named The <span>Sumatra–Andaman earthquake </span>
Answer:
Mountains are higher than hills.
Explanation:
