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On a train ride cross-country, the trees, buildings, and people appear to be speeding by the window. This is because the train is moving in the forward direction.
Scientists use the shared system for making measurements. This system is also called system of international.
Physical science studies the relationships between natural but non-living objects. Physical science is ordinarily thought of as consisting of four broad areas: astronomy, physics, chemistry, and the Earth sciences.
If 6.6 tyrannosaurs weigh 30,000 kg, then one tyrannosaur weigh about 4545 kg. For most activities, the earth makes a handy frame of reference.
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