Igive 30 points +mark ! directions look at each set of four vocabulary terms following each number. on the line provided, write the letter of the term that does not relate to the others. 6. a. clermont b. robert fulton c. tom thumb d. steamboat 7. a. tom thumb b. steamboat c. peter cooper d. locomotive 8. a. coal b. steel c. fuel d. wood

first option i assume

explanation:

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.