The main evidence that supports the claim that water on planet Earth came from asteroids is the presence of certain water isotopes.
Scientists believe water on Earth may have originated from asteroids. The current main evidence for this is the presence of water isotopes on Earth with the same distribution as those on Vesta. Vesta is the second-largest asteroid near Earth, this equal distribution provides a strong claim that the isotopes for water on Earth may have an extraterrestrial origin.
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The crusades lasted from around 1096 to about 1291, making the answer early 200 years.
The battle of Saratoga was a turning point in the American Revolution simply because, with their defeat of the British, the colonists showed that they were willing to fight for their freedom, and because of this, they won the support of European allies, like France and Spain. France later proved to be essential at the Battle of Yorktown because it was the French fleet that blocked in Cornwallis' troops, preventing him from escape, which of course caused him to surrender, ending the Revolution.
<span>The president is elected as the leader of the country, such as he or she is the head of state. Also, he or she runs the government; the president is also the head of government. The monarch is the head of state for the United Kingdom, so the prime minister is merely the head of government.
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