Ice Age was a lot colder, so there was much more barren landscape such as tundra. Icebergs were also present everywhere, and recently (not actually recently but in the whole scheme of time) the icebergs melted, creating rivers and lakes wherever they went, as they were so heavy that they would literally carve out new landscapes.
Some scientists stick to the term, the snowball earth. They say millions of years ago earth was under the grip of the biggest ice age ever. The earth was completely covered with ice from pole to pole. The ice was around a km thick. Global temperature fell so low that the equator was as cold as modern day Antarctica.