Final answer:
During the Ice Age, glaciers covered much of Earth, including regions now much warmer, extending over parts of present-day Russia, Scandinavia, Britain, Greenland, Canada, and the northern US.
Step-by-step explanation:
The question: What parts of Earth did glaciers cover during the Ice Age can be answered by stating that during the Ice Age, glaciers covered much of Earth, including parts that are much warmer today. During the most recent glaciation period, which peaked about eighteen thousand years ago, ice sheets sometimes two miles thick extended outward over much of present-day Russia, Scandinavia, the British Isles, Greenland, Canada, and the northern reaches of the United States.
These glaciations were part of a series of ice ages Earth has experienced, primarily due to changes in the tilt of Earth's rotational axis. Significant cooling periods in Earth's history led to sea levels falling as water was trapped in glaciers, creating land bridges between continents, allowing for the movement and migration of land animals to new areas.