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Earth Science

Subject : 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. The partial or complete blocking from view of one object by another.






2. A portable time keeper with a mechanism for ensuring accuracy and adjusting itself & used for determining longitude at sea.






3. The mass of an object divided by its volume.






4. A valley carved by glacier erosion and whose cross-valley profile has steep sides and a nearly flat floor & suggestive of a large letter 'you'.






5. The dust-sized & sharp-edged & glassy particles resulting from an explosive volcanic eruption.






6. The solid innermost part of the core with a diameter of a little over 1 &200 km.






7. An instrument that merely indicates the occurrence of an earthquake.






8. An abandoned meander .






9. A permeable region of rock or soil through which ground water can move.






10. A time of unusual winds and currents in the Pacific Ocean . El Nino generally causes warmer-than-normal sea surface temperatures and increased rainfall and storm activity.






11. To change back and forth uncertainly.






12. Heat transport by moving particles & and the thermal energy that they carry & to a new location.






13. Any of various minerals prized for beauty & durability & and rarity. A few noncrystalline materials of organic origin (e.g. & pearl & red coral & and amber) also are classified as gemstones.






14. A person who makes maps.






15. A naturally occurring inorganic solid that has a well-defined chemical composition and in which atoms are arranged in an ordered fashion.






16. An accumulation of wind driven sand into a distinctive shape.






17. The perpendicular or very steep descent of a stream.






18. To wash or scrub away.






19. That portion of the resources for a valuable mineral commodity that can be extracted from the Earth at a profit today.






20. A valley caused by extension of the Earth's crust. Its floor forms as a portion of the crust moves downward along normal faults.






21. Deposits of wind-borne dust.






22. A volcanic mountain on the seafloor. If flat-topped & it is a guyot.






23. Water beneath the Earth's surface.






24. An eon of geologic time extending from about 3.9 billion years to 2.5 billion years ago.






25. A molecule composed of three atoms of oxygen and mostly found in the stratosphere. Though beneficial in the upper atmosphere & at ground level & ozone is called photochemical smog & and is a respiratory irritant and considered a pollutant.






26. The areas of & in & or constituting a city.






27. The two days of the year on which neither hemisphere is tilted toward or away from the sun.






28. The partial or complete blocking from view of one object by another.






29. Deserts formed by blocking moisture-bearing winds with mountain barriers.






30. A sharp bend & loop or turn in a stream's course. When abandoned & it is called a meander scar or an oxbow.






31. The green pigment in the cells of many plants that enables them to use sunlight to convert carbon dioxide and water into carbohydrates in the process called photosynthesis.






32. A measure of acidity.






33. The rigid outer shell of the Earth. It includes the crust and uppermost mantle and is on the order of 100 km in thickness.






34. The study of earthquakes & and of the structure of the Earth by both natural and artificially generated seismic waves.






35. The closest galaxy to the Milky way. It is approximately 2 million light-years away.






36. An informal term to include all geologic time from the beginning of the Earth to the beginning of the Cambrian period 570 million years ago.






37. Geologic time expressed in years before the present.






38. A substance that produces negatively charged hydroxide ions ( OH- ) in water and reacts with acids to form salts.






39. A hydrocarbon (coal or petroleum) that can be extracted from the Earth for use as a fuel. Fossil fuels are non-renewable energy sources.






40. A mudflow composed chiefly of pyroclastic material on the flanks of a volcano.






41. The point on the Earth's surface directly above the focus of an earthquake.






42. Scratches & or small channels & gouged by glacier action. Occur on boulders & pebbles & and bedrock. Striations along bedrock indicate direction of ice movement.






43. A spring whose temperature is 6.5o C or more above mean annual air temperature.






44. The process of mountain building.






45. That portion of the Earth below the crust and reaching to about 2 &780 km & where a transition zone of about 100 km thickness separates it from the core.






46. Large area of extremely flat ocean floor lying near a continent and generally over 4 km in depth.






47. A zone in the Earth between 400 and 670 km below the surface separating the upper mantle from the lower mantle.






48. A sea level change due to change in load on Earth's crust.






49. The process of one plate descending beneath another.






50. To preserve & or to avoid wasteful use.







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