Which of the following is an example of how humans negatively affect the quality of water on Earth? * 1 point A. overfishing of lakes B. cleaning up riverbeds C. runoff from dairy farms D. building man-made ponds

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?