The Underground Railroad is not a railroad that is underground, instead, it is referring to a secret passage for slave escaping in safe houses. The conductor of the Underground Railroad could be the person who helps the slave escape, the lines could refer to the road or the passage which the slaves escaped from one safe house to another, the station could refer to the stops they make in the safe houses, and the freight may refer to the slaves that are escaping.
If you eat pine nuts, berries, and salmon as part of your diet, you likely live in the "Pacific Northwest," since this is where all of these items can be found (generally speaking).
A. Don’t just accept traditional knowledge about how the natural world works—experiment and observe the results.
