Radar is technology that _________the presence of another object further away. Radar is based on__________. A German man discovered the concept of radar but a British inventor Watson-Watt ___________it. A working radar system was only developed during World War ll in________________. By 1940, the British built 51_______________along the coastline of England. The radar stations¬¬¬¬_________ radio waves into the air, which hit the approaching German plane. Without____________, many historians argue that Britain could have easily lose the war.
Look at the graphic organizer below and fill in the blanks about the writer’s purpose using