Final answer:
Words are sorted into two main groups based on their roots: 'liter-' and 'trans-'. 'Liter-' includes words related to writing, while 'trans-' includes words related to crossing or moving beyond.
Step-by-step explanation:
The question requires sorting words based on the meanings of their shared roots into groups. We have two distinct root categories here: one related to 'liter-' which means 'letter' or 'related to writing' and 'trans-' which means 'across or beyond'. For this exercise, the words literature, literary, and letter are derived from 'liter-', while across, transfer, transatlantic, transport, and transcontinental are derived from 'trans-'. Additionally, careful attention must be paid as some words could be sorted into more than one group based on shared roots or spelling patterns.