We often think of above and below in terms of height, but it is a relative term and height is a comparative term. There is a slight subtlety here that will be understood with practise.
There is also a subtle difference with Over and Under, in that these terms can be used with measurements other than height: for example, speed, or rate of feeding (over-fed, under-fed). Exercises could get children to find out the uses of these words, getting them to explain what their findings mean.
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