As the library clock ticked toward midnight, Leo clicked through page after page of broken links and "Survey Required" pop-ups. Then, he saw it: a file titled Section_15.3_Master_Key.pdf .

Reducing energy needs (e.g., turning off lights) and increasing the efficiency of devices. Renewable Resource Matching Description Water pumped below ground is converted to steam Geothermal The most likely raw material is hydrogen Nuclear Fusion Mirrors concentrate sunlight to produce electricity Kinetic energy of moving air turns a turbine Energy obtained from flowing water Hydroelectric Chemical energy stored in wood, peat, or waste Helpful Resources Study Aids:

Using technology to do the same work with less energy (e.g., switching to LED bulbs). Quick Study Check: Which fossil fuel is the most abundant in the US? What is a major downside of solar power? (Climate/Time dependency) What is the primary benefit of hydrogen fuel cells? (The only byproduct is water vapor) Need help with a specific question from your worksheet? text of the question below and I'll walk you through the logic!