Section 15.3 Energy Resources Answer Key Pdf

This guide breaks down the essential scientific concepts found in Section 15.3, provides study strategies to help you ace your assignments, and explains how to use answer keys as effective learning tools. 1. Core Concepts Covered in Section 15.3

| # | Question | Answer | |---|----------|--------| | | What are nonrenewable energy resources? | Energy resources that exist in limited amounts and cannot be replaced quickly. | | 2. | List four examples of nonrenewable energy resources. | a. Coal, b. Oil (petroleum), c. Natural gas, d. Uranium (nuclear fuel). | | 3. | Circle the letter of each resource that is considered to be a fossil fuel. | a. ~~tree~~, b. ~~uranium~~, c. oil , d. coal | | 4. | Is the following sentence true or false? Although fossil fuels are evenly distributed throughout Earth, they only represent ten percent of total energy consumed. | False —Fossil fuels are not evenly distributed; some regions have abundant reserves while others have none. Also, fossil fuels represent much more than 10% of global energy consumption (actually about 80%). | | 5. | What are some advantages and disadvantages of using fossil fuels as a source of energy? | Advantages: High energy density, reliable, existing infrastructure. Disadvantages: Finite supply, environmental damage, climate change. | | 6. | An energy resource that can be replaced in a reasonably short period of time is called a(n) ______ resource. | Renewable | | 7. | Circle the letter of each sentence that is true about renewable energy resources. | a. Wind and solar energy are both renewable energy resources. c. Renewable energy resources can be used to generate electricity and to heat homes. (b is false because renewable resources are not always more efficient; d is false because magma does not generate most renewable energy.) | | 8. | Describe one energy conversion that takes place during the generation of hydroelectric power. | The potential energy of water stored behind a dam is converted into kinetic energy as it flows down, which is then converted into the rotational energy of a turbine, and finally into electrical energy by a generator. | | 9. | Is the following sentence true or false? One disadvantage of hydroelectric power is that it is among the most expensive energy sources. | False —Hydroelectric power is actually one of the cheapest sources of electricity once the dam is built. | | 10. | Water pumped below ground is converted to steam. | c. geothermal | | 11. | The most likely raw material is hydrogen. | f. nuclear fusion | | 12. | Mirrors concentrate sunlight to produce electricity. | b. solar | | 13. | Kinetic energy of moving air is converted into rotational energy of a turbine. | d. wind | | 14. | Energy is obtained from flowing water. | a. hydroelectric | | 15. | Chemical energy stored in wood, peat, and agricultural waste can be converted into thermal energy. | e. biomass | | 16. | Is the following sentence true or false? Hydrogen fuel cells generate electricity by combining hydrogen with oxygen. | True | | 17. | What are two ways that energy resources can be conserved? | 1. Using energy more efficiently (e.g., LED bulbs, Energy Star appliances). 2. Reducing energy use through behavioral changes (e.g., turning off lights, walking instead of driving). | | 18. | Name two practical ways in which people can conserve energy. | Any two of: turning off lights, unplugging idle electronics, lowering the thermostat, taking shorter showers, carpooling, etc. | section 15.3 energy resources answer key pdf

Photovoltaic cells convert sunlight directly into electricity. This guide breaks down the essential scientific concepts

Resources used faster than they can form (fossil fuels and uranium). | Energy resources that exist in limited amounts