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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. 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.






2. Single-celled organisms which lack a nucleus.






3. Populations characterized by large size - long lifespan - and few offspring.






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






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






6. Water found in estuaries. This water is a mixture of saltine ocean water and fresh water - usually from a river or stream.






7. A type of farming where the farmer will grow crops both to fulfill his family's needs for the next year and to sell on the market.






8. Modern man.






9. A type of symbiosis where each species will benefit from interacting with the other.






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






11. A transitional area between two different ecosystems.






12. Grasslands with short - widely spaced trees and no canopy - allowing for an unbroken layer of grasses beneath.






13. A situation where a layer of warmer air traps lower - cooler air - causing pollution to collect near the ground.






14. Organisms which produce their own food.






15. The process by which pollutants are carried by flowing water - such as a river.






16. The study of the interaction between organisms and their environment.






17. Species which react quickly to an environmental change and therefore can be used to diagnose a particular ecosystem.






18. Integrating rows of trees alongside crops to provide mulch and shade - retain water in the soil - and promote sustainable land use.






19. The decomposition of organic nitrogen into inorganic ammonium. This process is also called mineralization.






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






21. Consumers which eat decomposing organic material.






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






23. Growing only one crop at a time.






24. Animals which eat leaves and shoots.






25. An agency created to establish regulations concerning pollutants to protect humans and the environment.






26. The process of a substance passing directly from the solid phase to the gaseous phase - and vice versa.






27. The crust and upper mantle of the earth.






28. 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.






29. A rainforest in the temperate zone which receives heavy rainfall.






30. An extinct hominid species believed to have long - ape-like arms; have a brain capacity half that of modern men; and use primitive tools.






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






32. The first atmospheric layer. Most weather and pollution occurs here - and the temperature decreases with altitude.






33. An extinct hominid species believed to exhibit the first example of full-time bipedalism.






34. The process by which certain kinds of bacteria convert atmospheric nitrogen gas into ammonia - a form accessible to living creatures.






35. Evolution in one organism due to change in a related organism.






36. The process of planting trees in between other crops.






37. A shubland found primarily in the South-Western United States and Mexico. Fire plays a predominant role in the life-cycle of the plants in this area - the seeds of which will sprout only after a fire.






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






39. Organisms with a nucleus.






40. The area between the troposphere and the stratosphere. Here the temperature reverses from decreasing to increasing with altitude.






41. Consumers which eat both plants and animals.






42. The infiltration of harmful chemicals - particles - or biological matter into the atmosphere which endanger living organisms. Pollutants include sulfur and nitrogen oxides - ammonia - and chlorofluorocarbons. Although there are natural sources for th






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






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






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






46. A variety of species living together.






47. The biggest atmospheric layer. Without ozone - UV radiation causes ionization and the auroras in this layer.






48. Excess water which cannot be infiltrated into the soil and instead flows along the ground.






49. The process by which a new species is created. This process generally requires geographic isolation to prevent interbreeding between the newly emerging species and the parent species.






50. Growing more than one crop at a time.







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