I am what many beaches attract.

I am the longest river in North America.

I use a unit of measurement to show a real distance.

I am a type of mine where children could not work.

I am why oranges and cotton are grown in the Southeast.

I am what a large map scale shows.

I am another name for farming.

I am where most of the U.S.'s coal comes from.

I am where the Mississippi River flows into the Gulf of Mexico.

I am what made coal easier to buy.

I am a river that flows into a much larger river.

I am how silt changes a river.