THIRD GRADE
problem 21: How long is our Ohio River?
problem 46: What state produces the most coal?
FOURTH GRADE
problem 21: How long is our Ohio River?
problem 37: Curbside recycling in Vanderburgh
problem 44: 10 states with the highest energy users
problem 46: What state produces the most coal?
fifth GRADE
problem 37: Curbside recycling in Vanderburgh