The hydrological cycle is a closed system. What does this mean? This means that there is a definite amount of water in the system, and that this amount does not change This means that there..查看文章
The perimeter of a shape is the distance around the outside. It is a length so is measured in mm, cm, m, km or any other unit of length. 1. Calculate the lengths of the missing sides. The to..查看文章
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