Slaves in the Athens culture worked along side with the slaves while Sparta slaves had the do all the farming and stuff because war and being physically strong was more important to them.
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The jet stream has high altitude rivers of air.
When scientists use the law of superposition to determine the age of a fossil, they go by the principle of 'every undisturbed layer of rock is older than the layer above it. This is not the most precise way of determining age, and in fact this method can only reveal the approximate age, but not the exact one.
The North Celestial Pole is the point in the sky about which all the stars seen from the Northern Hemisphere rotate.