What are the Earth's resources? -- How are energy resources used? -- What are nonrenewable resources? -- What is coal? -- What are oil and natural gas? -- What are the problems with fossil fuels? -- What is nuclear power? -- What are renewable resources? -- What is solar power? -- What is wind power? -- What is hydroelectric power? -- How can the ocean produce electricity? -- What is geothermal power? -- How can we use fewer nonrenewable resources?.