Brown V. Board of Education helped the civil rights movement of the 50's as it declared that school segregation between white's and black's was unconstitutuional and therefor not allowed in the United States.
He was a Prussian chancellor.
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 :)
