Which variety of glass is heat resistant?

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1. The variety of coal in which the deposit contains recognizable traces of the original plant material is____________?

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2. A glass chimney stops an oil lamp from smoking because:

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3. Glass is made of the mixture of______________?

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4. The type of glass used in making lenses and prism is___________?

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5. Which of the following cannot be stored in glass bottle?

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6. Which one of the following of glass can cut ultraviolet rays?

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7. The hard, solid rocks, whose composition or texture has been changed by heat or pressure in the Earth are called____________?

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8. During which process does heat transfer occur because of density differences__________?

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9. The gas heater gives us heat by __________?

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10. If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called_________?

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