Gap Fill - Paragraph Two


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   alternative      areas      bases      combination      lot      materials      mixture      pee      source      waste  

Paragraph 2

Using astronaut and moon dust could save scientists a of money. It costs about $10,000 to transport 0.45kg of from Earth to the Moon. The urine and moon dust would be a much cheaper way of constructing things. A scientist said: "We have seen that a product, such as the urine of the personnel who occupy the moon , could be used." She added: "The actual water in the urine could be used for the , together with [water] that can be obtained on the Moon, or a of both." Scientists say another of water on the Moon is in the ice that exists in some . The scientists say they need to do more tests to find the best building material.

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