FIRST GRADE

problem 45: How many coal mines does our our community have?

SECOND GRADE

problem 3: How many unhealthy days in our area?

problem 7: Who has the cleanest car?

problem 43: Do we use lots of energy?

problem 45: How many coal mines does our our community have?

THIRD GRADE

problem 3: How many unhealthy days in our area?

problem 21: How long is our Ohio River?

FOURTH GRADE

problem 3: How many unhealthy days in our area?

problem 21: How long is our Ohio River?

problem 48: Our electricity price–high or low?

FIFTH grade

problem 3: How many unhealthy days in our area?

problem 48: Our electricity price–high or low?