Which  of the following materials is biodegradable?

Which does not include in 5R's techniques on waste management?

Means to create a new product using a material that has already served its purpose.

Means to use again or find other ways to use a material

Gold can be hammered into thin, flat sheets until the desired shape of jewelry is obtained.  What is this property of gold called?

It is the ability of a material to be stretched and then return to its original shape after. 

Which of the following statements is TRUE?

Henry observed that when he covered the lighted candle with a jar, the fire gradually went out. Why is this?

In order for fire to occur, which of these are needed?

Children are playing bahay-bahayan. They put a spoonful of sugar in a can and engaged it on fire. Few minutes later, they noticed that the sugar melted and eventually turned  brown in color. What kind of change happened to the sugar?