Erosion is the process by which soil and sediments are moved by gravity, wind, and water. Erosion occurs naturally, but it can be accelerated by human activity. Which of these human activities MOST contributes to soil erosion? 1 : Boating on a lake
2 : cutting down trees
3 : fertilizing a lawn

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?