| 41. | Seismologists think these basalts spewed from a heat source that lies deep within Earth.
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| 42. | The heat source is water heated in an electric boiler.
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| 43. | Modern silversmiths commonly use gas burning torches as heat sources.
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| 44. | Primary heat source is electricity-- 3, 349 ( 9 percent)
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| 45. | External combustion engines can run on any high-temperature heat source.
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| 46. | Add the coucous, cover and take off the heat source.
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| 47. | Place ribs on grill over pan of water not directly over the heat source.
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| 48. | And there is no internal heat source in the box.
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| 49. | Coffee's flavor deteriorates when it's left on a heat source.
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| 50. | Place peppers on a tray 6 inches below heat source.
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