Why does Pascal have a high code density? The plots in http://blog.wolfram.com/2014/06/04/how-the-wolfram-language-measures-up/ seems to indicate that Pascal has a relatively high code density.  What features of the language makes it so?

Follow-up question:

Does this explain why Pascal are often introduced in high schools as one of the first programming languages?
What makes Pascal dense is not the features it has, but the features it doesn't. Here is a small list of features that make other languages less dense:


higher order functions
classes and inheritance 
specialised syntax for sets, lists, hashes
built in regular expression syntax
good libraries