Answer: The Earth is a closed system for matter
That is a list of all basic elemental materials on our planet. Because of gravity, matter (comprising all solids, liquids and gases) does not leave the system.
6x+4y=13
-(3x+4y=8.5)
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3x=4.5 =x=4.5/3=1.5
It will be 1.5
From 1922-1991, Russia would have been considered a autocratic state.
2 definitions:
an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
a celestial body orbiting the earth or another planet
