PLEASE HELP!!!)))
Find the mistakes and write down the correct sentences.
1.European explorers crossed the atlantic ocean before the 15th century.
2. They knew a lot about the atlantic ocean.
3. Columbus saw america for the first time on the 10th of october, 1492.
4. It took him 5 months to cross the atlantic ocean.
5.They had very fast ships.
6.We celebrate columbus day on the 14th october.