Which of the following is considered chemical weathering? A. A rock splits because tree roots wedged into a crack.

B. Water freezes in a crack in the rock and expands, splitting the rock.

C. A limestone rock dissolves due to acid rain.

D. A rock broke into chunks after being tossed around in a river.

Which of the following was not an effect of bolsa familia and the program to erradicate child labor (peti)? a. child labor was eliminated in brazil. b. 40 million families were lifted out of the lowest income level. c. the average years of schooling increased. d. more children began to graduate from high school.