Question

1. How do the researchers know that the hardened chunks of bitumen (a form of crude oil) are part of a boat? in lesson 3 The Bronze Age and Umm an-Nar ​

Answer 1

Answer:

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Answer 2

Bitumen, commonly referred to as asphaltum or tar, is a naturally occurring organic residue of decomposing plants. It is a black, oily, viscous type of petroleum. This amazing natural material, which is waterproof and combustible, has been used by humans for at least 40,000 years in a range of chores and instruments. Today's globe employs a variety of processed varieties of bitumen for things like house roofing, paving roadways, and adding to gas fuels like diesel. In British English, bitumen is pronounced "BICH-eh-men," but in North America, it is "by-TOO-men."

• The thickest type of petroleum is called natural bitumen, which contains 83% carbon, 10% hydrogen, and smaller amounts of oxygen, nitrogen, sulphur, and other components.
• It is a low-molecular-weight natural polymer that exhibits extraordinary thermoplasticity, changing from hard and brittle at low temperatures to flexible at room temperature and flowing at high temperatures.

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