When oil and gas resources are burnt they kill many forests and lakes by ________________ ?

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At what time of day is the relative humidity normally at a minimum ________________ ?

A. When the air temperature is highest B. Just before sunrise C. About midnight D. When the air temperature is lowest...

There are__________ kinds of Joints in human body?

A. 4 B. 5 C. 6 D. 7...

Which variety of glass is heat resistant?

A. Bottle glass B. Flint glass C. Hard glass D. Pyrex glass...

Which liquid is used in an aneroid barometer?

A. Mercury B. Alcohol C. Water D. None...

Who was the first to measure the earth circumference?

Eratosthenes Galileo Copenicus Ptolemy...