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1. First reported by spanish explorers in 1796, the asphalt in California's La was mined (commercial) for many years. commercially
2. New York City's theatrical district (was concentrated the) Bowery from 1860 to 1875, and aroud 1900.
3. The chemical element chlorine is a corrosive, greenish-yellow gas that has sharp odor and (has) three times heavier than air.
4. (Different fourteen ) crops were being grown 8600 years ago.
5. Saturn takes almost 30 Earth years to make one trip around the Sun,( during) Jupiter takes about twelve Earth years to complete one solar revolution.
6. Astronaunts receive extensive training to prepare themselves both physically and psychologically( for complexity) and rgor of a space mission.