1. The Ice Age
They survived during the times when much of the earth was covered by immense large bodies of ice that buried forests, fields, and mountains, but rapidly became extinct after the ice began to retreat and melt. ... The left over carcasses of these animals were often burned for light and heat in the frigid climate. ... The rapid environmental switch from glacial to interglacial caused the forests and grasslands to shrink for a period of time. ... But with the retreat of the ice came a dry period and many spruce forests were replaced by pine and hardwood. This crisis seemed to effect...
- Word Count: 1766
- Approx Pages: 7
- Grade Level: High School