Houghton Mifflin Social Studies
Chapter 4, Lesson 1: Uncovering Clues to Our Past (pp. 90-95)
I. Clues from Archaeology
B. The fossil record of early humans shows that brain size and toolmaking ability grew over the centuries.
C. The "Old Stone Age," the very beginning of toolmaking, began about 2.5 million years ago and lasted until around 10,000 B.C.
II. The Ice Age
B. During the colder periods of the Ice Age, early humans had to learn to make shelter, fire, and clothing.
C. As water froze, ocean levels dropped, allowing land bridges to arise and enabling early humans to colonize every continent except Antarctica.
Lesson at a Glance Outline
A. Archaeologists use fossil bones, tools, and other artifacts to learn about the earliest people.
A. During the Ice Age, about 2.5. million years ago until about 12,000 years ago, glaciers advanced and stretched over large areas of the earth.
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