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DSST Environment And Humanity

Subjects : dsst, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. All of the water found on earth.






2. The amount of variation among organisms living in a particular ecosystem. The loss of this key characteristic leads to a reduction in ecosystem efficiency and the ability of species to adapt to new situations.






3. A law designed to locate toxic waste sites - gauge their pollution level - and ensure these sites are taken care of properly.






4. An extinct hominid species with near the same brain capacity as modern man believed to use fire and stone tools - live a hunter/gatherer lifestyle - and speak a language.






5. A principle that states that two species competing for a single resource cannot coexist. One species will inevitably gain an advantage over the other - causing the looser either to migrate or to become extinct.






6. An act which protects certain lands as national parks.






7. A greenhouse gas. Although it is a natural part of the carbon cycle - the atmospheric concentration of this gas has increased due to the burning of fossil fuels.






8. Growing more than one crop at a time.






9. The spraying of pesticides to prevent a pest problem before it happens.






10. Animals which eat leaves and shoots.






11. All members of a species which live in the same area.






12. Plants taking in nitrates from the soil.






13. A layer of gasses surrounding the earth.






14. The process of a gas transforming into a liquid.






15. An act requiring federal agencies to detail the impact of proposed environmental policies.






16. Exceptionally acidic (low pH) rain. This phenomenon is caused mainly by emissions of carbon dioxide - sulfur dioxide - and nitrogen oxide which react with water particles in the air.






17. Political organizations not affiliated with the government which try to bring about social change.






18. A bloom of phytoplankton in a body of water caused by an abnormal increase in nutrients. This process depletes the water's oxygen level - killing off other aquatic organisms.






19. A greenhouse gas which also plays a key role in regulating ozone levels.






20. A UN conference that addressed the growing population problem.






21. An international protocol designed to protect the ozone layer by phasing out the production of CFCs and other harmful chemicals.






22. The cycling and reusing of elements and molecules (such as water - nitrogen - and phosphorus) that are essential to life.






23. An influential book by Rachel Carson which helped begin the environmental movement.






24. The combination of evaporation from the ocean - lakes - and other bodies of water and transpiration - the loss of water from plants.






25. Forests found in the northern regions of North America - Europe - and Asia characterized by freezing winters and warmer summers. These forests lie just below the tree line.






26. The process by which the sun's energy converts liquid water to water vapor in the atmosphere.






27. A theory that our current ecological problems are a product of deeper social problems.






28. The rapid increase of harmful algae in a body of water.






29. All of the ecosystems on earth.






30. A forest found in temperate regions with warm summers - cool winters - and plenty of rainfall. These kinds of forests are characterized by evergreens and deciduous trees.






31. The cloudiness of a liquid due to small suspended particles.






32. The rate at which producers create organic material.






33. Species which serve key roles in an ecosystem. The absence of these important organisms is detrimental to the surrounding area.






34. A transitional area between two different ecosystems.






35. The amount of pests needed before spraying pesticides is economical.






36. A type of farming where the farmer will grow just enough crops to satisfy his family's needs for the next year.






37. The uppermost atmospheric layer. Here satellites orbit the earth.






38. The place of an organism in an ecosystem - such as what it eats and how it interacts with other organisms.






39. Organisms which thrive in low nutrient environments and usually have slow growth rates.






40. An extinct hominid species believed to have the same brain capacity as modern man and use many different weapons.






41. The oxification of ammonia by certain bacterium into nitrite and later into nitrates - which can then be used by plants.






42. A forest characterized by clearly differentiated seasons - such as the trees loosing leaves in the fall and heavy snowfall in the winter.






43. Any living thing on earth.






44. The flow of water in the water table.






45. An act which required the EPA to set standards for drinking water.






46. Single-celled organisms which lack a nucleus.






47. A community of similar living organisms largely affected by the area's climate.






48. Precipitation which does not reach the soil but is instead collected by plants.






49. A form of management which attempts to satisfy both the needs of humans and those of wildlife in the best way possible for both parties.






50. An unstable form of oxygen which protects the earth from UV radiation. Although naturally occurring in the stratosphere (upper atmosphere) - in the lower atmosphere this gas acts as a pollutant.







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