1. what percent of the earth’s surface is covered by oceans? how did you calculate this percentage?

71% of the earths surface is covered by oceans
You can calculate this by figuring out the percent of land there is and subtracting it by 100 and you should get 71%

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Answera discharge of static electricity;