• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

Ice Ages

Enormous ice sheets have at times spread across the globe, bringing with them a cold climate. One definition holds that the advance of glaciers to middle latitudes marks an ice age. Another, and perhaps complementary, definition holds that the spread of ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles