Reference sources - The Big 4

You are doing a report and need to find detailed information on our first president, George Washington. Where should you look?

What resource should you use to find out what the word "gregarious" mean?

You need to know where the 10 deadliest earthquakes in the world occurred. What resource should you use?

What resource would you use to learn the most downloaded free app for an iPhone?

What resource should you use to help you figure out how to pronounce the word "aisle" correctly?

I need to think of a synonym for the word "awesome." What resource should I use?

After I read the biography, Small Steps, I was curious about the disease called polio. Where can I look to find out more information?

What resource should I use to find out the name of the body of water that lies east of Chicago, IL?

Somebody said I was "pessimistic." I wonder what that means? What resource should I use to find out what that word means?

What resource should I look in to find out which country has the most deadly earthquakes?