Science 10 Chapter 1 Page 8 to 45 Page 4

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Across
  1. 2. Factors caused by the presence and roles of other living things are called ?.
  2. 4. ? are a natural part of many ecosystems.
  3. 7. Lakes, rivers, forests, deserts and meadows can all be classified as natural ecosystems. In a ? ecosystem, the living community is free to interact with the physical and chemical environment.
  4. 9. ? is the process by which green plants use sunlight energy to produce carbohydrates (sugars).
  5. 12. ? cover also increases the albedo of the Earth.
  6. 16. Of the energy released by the Sun only about one ? reaches Earth - after a journey of about 150 million kilometers.
  7. 17. It should come as no surprise that the ecotones, by providing alternative food sources, guard against ?.
  8. 18. ? are naturally occurring plants that have fallen out of favour with humans.
  9. 19. ? has a high albedo.
Down
  1. 1. Of the energy that penetrates into the lower atmosphere, 30% is reflected by ? or the Earth's surface. The remaining 70% warms the surface of the planet, causing water to evaporate and generating the water cycle and weather.
  2. 3. The collection of all the populations of all the species in an ecosystem or habitat is called the ? of organisms.
  3. 5. A very small ecosystem is called a ?.
  4. 6. An ? ecosystem is planned or maintained by humans.
  5. 8. Organisms do not live in isolation. Organisms usually group with others of the same species. All of the members of the same species, living in the same ecosystem or habitat, are referred to as a ?.
  6. 10. There is often a grey area between ecosystems where organisms from both ecosystems interact with each other. These transition areas or ? contain species from both bordering ecosystems, so they often contain greater biodiversity (more species) than either ecosystem.
  7. 11. Snow contributes to the ? temperatures of winter by reflecting energy from the Sun back into space. Snow also delays warming in the spring.
  8. 13. Sunlight also provides the energy used by green plants to make the compounds that ? their lives and serve as food for all other organisms.
  9. 14. Some materials reflect sunlight better than others. ? is a measurement of the percentage of light that an object reflects.
  10. 15. The source of all energy for ecosystems is the ?.