cross channel links

ports - containers

Britain from the Air: Stocking Britain

Extended writing - link words

Adding:
and, in addition, moreover, furthermore, indeed, again, similarly, likewise, also, next, first ... last, finally, subsequently, too, in addition, what is more, as well as, at this stage, at the same time, on the one hand

Drawing conclusions:
so, thus, therefore, then, hence, generally, consequently, because, since, to this extent, at most, in conclusion, as a result, because of this, in this way, due to, in the case of, nevertheless

Comparing and contrasting: (remember - don't just describe one thing and then write a separate paragraph about the other ... you need to bring out the similarities and differences - use these link words...)
thus, however, whereas, although, on the other had, by contrast, similarly, an exception to this, even though, instead of, unlike, in spite of

Giving examples: (so important for L3 answers)
for example, when, in particular, for instance, such as.