| ACROSS
1. An organization of countries formed in 1961 to agree on a common policy for the sale of petroleum.
5. A soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal.
7. Catch sight of.
11. The United Nations agency concerned with atomic energy.
12. A soft silvery metallic element of the alkali earth group.
13. Fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period.
14. A state in southeastern United States.
15. A small pellet fired from an air rifle or BB gun.
17. Remove completely from recognition or memory.
19. Large brownish-green New Zealand parrot.
21. Having been read.
22. The most common computer memory which can be used by programs to perform necessary tasks while the computer is on.
23. An agency of the United Nations affiliated with the World Bank.
24. A radioactive element of the actinide series.
25. Having undesirable or negative qualities.
27. Aircraft landing in bad weather in which the pilot is talked down by ground control using precision approach radar.
30. 35th President of the United States.
31. The content of cognition.
33. A metrical unit with unstressed-stressed syllables.
34. A flat-bottomed volcanic crater that was formed by an explosion.
39. Essential oil or perfume obtained from flowers.
42. An amino acid that is found in the central nervous system.
43. English illustrator of several of Dickens' novels (1815-1882).
47. An enclosed space.
48. A river in north central Switzerland that runs northeast into the Rhine.
49. The elementary stages of any subject (usually plural).
50. The residue that remains when something is burned.
51. A German art song of the 19th century for voice and piano.
52. The cry made by sheep.
53. A unit of length of thread or yarn.
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DOWN
1. Utter a high-pitched cry, characteristic of pigs.
2. The rate of moving (especially walking or running).
3. The branch of engineering science that studies the uses of electricity and the equipment for power generation and distribution and the control of machines and communication.
4. A compartment in front of a motor vehicle where driver sits.
5. The blood group whose red cells carry both the A and B antigens.
6. (Greek mythology) Goddess of the earth and mother of Cronus and the Titans in ancient mythology.
7. Liquid containing proteins and electrolytes including the liquid in blood plasma and interstitial fluid.
8. The act of rising upward into the air.
9. Large burrowing rodent of South and Central America.
10. (cosmology) The original matter that (according to the big bang theory) existed before the formation of the chemical elements.
16. (informal) Exceptionally good.
18. A federal agency established to regulate the release of new foods and health-related products.
20. An officer who acts as military assistant to a more senior officer.
26. A public promotion of some product or service.
28. An independent agency of the United States government responsible for collecting and coordinating intelligence and counterintelligence activities abroad in the national interest.
29. A river in north central Switzerland that runs northeast into the Rhine.
32. Filled with the emotional impact of overwhelming surprise or shock.
35. A colorless and odorless inert gas.
36. Of or in or relating to the nose.
37. Lower in esteem.
38. Russian country house.
40. Of or relating to or characteristic of Thailand of its people.
41. Hoop that covers a wheel.
42. The blood group whose red cells carry both the A and B antigens.
44. Extremely pleasing.
45. A loose sleeveless outer garment made from aba cloth.
46. South American wood sorrel cultivated for its edible tubers.
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