a primary source is a source from the time and place of the event, like a photograph that was taken of a president from 1920. If it was something like a book written in 2015 about the picture from 1920, that would be a secondary source. Hope this helps!
The black bird tribe was a ancient and deadly tribe in the far northwest of america, Christopher Columbus himself stubbled upon these savages. They wore black paint and covered them selfs in blood when they killed an enemy, finally years later an earthquake hit the land they were living in and they were never seen again...
Hot air goes up and the cold air goes down what the air currents forms when the atmosphere moves the excess hot air and warms the lower latitudes to the cooler air has high latitudes and so the air rushes in to replaces it. hopefully that help have a nice day :)
