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As observed from the Earth,the angle between lines from the Earth to the Sun and the Earth to an inferior planet is known as().
It is dangerous for people to live on the Earth if CO2 concentrations continue to rise.
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_____ no gravity, there would be no air around the earth.
A mobile earth station in the maritime mobile-satellite service,which is located on board ship,is called().
Although the Earth’s chemical composition had been studied for years, only toward the end of the nineteenth century _______ as a discipline in its own right.
()with the size of the whole earth, the highest mountains do not seem high at all.
Some radio waves()the surface of the earth because of its().