Across
- 2. is the process of taking materials ready to be thrown away and converting (changing) them into reusable materials. Only certain products, including paper, plastic, glass, and metal, can be ___________, and the process of _____________ is different for each material.
- 4. power, power obtained by harnessing the energy of the wind.
- 5. layer, layer is an invisible layer of protective gases that circle the earth. The __________ ___________ stops most of the harmful ultraviolet rays, or UV rays, from hitting Earth.
- 8. source, "the ability to do work". ___________ is how things change and move. It's everywhere around us and takes all sorts of forms. It takes ____________ to cook food, to drive to school, and to jump in the air.
- 10. or petrol, is a toxic, clear liquid that is mostly used as a fuel in internal combustion engines. It is made by boiling petroleum, a fossil fuel. In a distillation process, petroleum is heated to a very high temperature, then it separates into its components, one of them is ________________.
- 11. is the expansion of desert into the surrounding areas. The desert area in the world is getting bigger. _______________________ usually happens on the edge of deserts. It is caused by a variety of factors.
- 13. resource, is something that naturally occurs in nature. There are two types; renewable and non-renewable resources.
- 14. Protocol, on Substances That Deplete the Ozone Layer is an international treaty designed to protect the ozone layer from depletion by phasing out the production of a number of substances believed to be responsible for ozone depletion
- 16. are the daily or twice daily rise and fall of the oceans. ________ are caused by the gravitational pull of the moon and sun on the ocean.
- 17. gases, gases are gases in Earth's atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat that the sunlight brings from leaving the atmosphere. The main _____________ ____________ are: Water vapor. Carbon dioxide.
- 20. fuels, are fuels that come from old life forms that decomposed over a long period of time. The three most important ______________ are coal, petroleum, and natural gas. Oil and gas are hydrocarbons (molecules that have only hydrogen and carbon in them). Coal is mostly
- 21. make smaller or less in amount, degree, or size.
- 22. energy, is heat that comes from inside Earth. It is an alternative energy source that can be used for cooking, bathing, and heating. It can also be converted into electricity. ______________ _____________ is available anywhere on Earth's surface.
Down
- 1. is the power that is generated from moving water such as rivers. Renewable Energy. _______________ is a renewable energy source. This means that using a dam or a river to generate electricity doesn't use up any limited resources like coal or gasoline.
- 3. to the soil, stain or infected by contact or association
- 6. is the protection of things found in nature. It requires the sensible use of all Earth's natural resources: water, soil, minerals, wildlife, and forests. People who care about _________________ try to preserve natural resources so they will still be around in the future.
- 7. (CFC) are gases used for various purposes including solvents, refrigerants, and aerosol sprays. ... They are organic chemicals and contain carbon, (sometimes hydrogen,) chlorine, and fluorine.
- 9. is just any material made by plants and animals that we can covert into energy. _____________ has energy stored in it from the sun. Plants get energy from the sun through a process called photosynthesis. Animals get their energy indirectly from the sun by eating plants. Renewable Energy.
- 12. use again or more than once.
- 13. resources, are things that you can only use one time like oil
- 15. resources, resources are something that you can use over and over again like solar energy.
- 18. is the cutting down of forests or groups of trees which is then turned into non-forest use. These are usually converted to farms, ranches, or used for urban use. But it is happening more and more, and having a bad impact on our environment and climate change.
- 19. power, power obtained by harnessing the energy of the sun's rays.