Ключевые слова: aged, america, american, around, background, black, blackboard, board, chalk, chalkboard, chart, circuit, classroom, concept, continent, contour, country, design, destination, distance, draw, drawing, drawn, earth, education, geography, global, graphic, horizontal, land, learning, lesson, map, nation, outline, painted, school, sign, silhouette, states, text, texture, travel, united, united states of america, us, usa, white, write, wrote,