Geothermal Energy and Ocean Energy

2. Capable of being maintained long-term without depleting resources or harming the environment.
4. To restore or refill something that has been used up.
8. The process of decomposing organic waste, like food scraps, into nutrient-rich soil.
10. Using an item more than once instead of discarding it after a single use.
12. The process of restoring damaged or unusable land for human use, such as agriculture or development.
13. A designated site for the disposal of waste materials by burying them in the ground.
15. Rules or laws set by authorities to control or manage activities.
16. A system or group of people that oversee and make decisions for a country, state, or community.
17. Machines with blades that rotate due to wind, water, or steam to generate electricity.
19. The complete disappearance of a species when no living members remain.
22. Long-term shifts in weather patterns and global temperatures, often caused by human activities.
24. Large, moving pieces of Earth's lithosphere that shape the planet's surface through their interactions.
25. Moving back and forth in a regular rhythm, such as ocean waves or a pendulum.
26. A prolonged period of little or no rainfall, leading to water shortages.
29. A resource that can be replenished naturally over time, such as solar or wind energy.

1. The extraction of minerals, metals, or other valuable resources from the Earth.
2. Energy harnessed from the sun’s rays to generate electricity or heat.
3. Transportation services like buses, trains, and subways that are available to the public.
5. A fossil fuel composed mainly of methane, used for heating and electricity generation.
6. Natural pools of heated water that emerge from the Earth due to geothermal activity.
7. A mineral used in electronic devices, primarily for making capacitors in smartphones and laptops.
9. The presence of harmful substances in air, water, or soil, making them unsafe.
11. A severe shortage of food leading to widespread hunger and malnutrition.
14. The regular rise and fall of sea levels caused by the gravitational pull of the moon and the sun.
18. The process of converting waste materials into new products to reduce waste and conserve resources.
20. The introduction of harmful substances into the environment, negatively impacting air, water, and land.
21. Gases like carbon dioxide (CO₂) and methane (CH₄) that trap heat in the Earth's atmosphere, contributing to global warming.
23. A natural or artificial lake used to store water for human use.
27. Heat energy generated and stored within the Earth, often used for heating or electricity production.
28. An underground railway system used for public transportation in cities.