13. Steel
14. Brass is an alloy made up of copper and zinc. Brass is harder than copper metal and is ofo a golden color. It is used in plumbing and lighting fixtures, rivets, screws, and ships.
15. Sustainability: present-day activities that preserve the ability of future generations to thrive and meet their resource needs.
16. a. Reusing is the act of using something again, while recycling is to convert something into a previous stage making it reusable. b. An example of reusing is taking lightbulbs and turing them into beautiful vases for flowers! An example of recycling is taking paper and turning into a beautiful paper dress!
17. a. solar power, hydroelectric power, wind, and geothermal energy. b. nuclear fuel, fossil fuels, uranium, gold.
18. a. reusing b. recycling c. reusing
19. They are alike because they were both made and then used until the last disposal.
20. Because a scientific law cannot be opinionated as correct or incorrect, as it is scientific fact.
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