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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Volga River is the longest river in Europe.
It is also a source of hydroelectricity for many Russian cities along its basin
Saudi Arabia's economy is petroleum-based.
Oil accounts for 90% of the country's exports and nearly 75% of the government's revenues.
Well first off you can learn about Global Warming and how to help stop it so you can make a difference in the world! You could also learn about what types of animals that you can save or that you want to help or maybe even what to do about all sorts of stuff that you want to learn about.
The most significant advantage of using renewable energy sources is that is sustainable (as a result of the fact that is renewable) and the low Greenhouse Gas Emissions.Renewable energy sources do not pollute the environment it with Co2 and other toxic gases that are produced by fossil fuels.