Land Bridges
During an Ice Age, when the world is colder, more of the world's water freezes
into ice. So less water is in the oceans than before. This makes the level
of the oceans lower, like the water in your bath is lower if you let some
out. Because the ocean level is lower, more of the land sticks out, like
your knees in the bath.
In some places, this makes islands where before the land had been underwater.
In other places, this makes a long bridge of land that connects two different
continents. During the last Ice Age, there was a land bridge between East
Asia and North America, leading from
Siberia to Alaska, and most archaeologists think that some people and dogs
crossed over this land bridge and began to live in North
America at that time.
To find out more about ice ages and land bridges, check out this book from Amazon.com or from your library:
Archaeology for Kids: Uncovering the Mysteries of Our Past, by Richard Panchyk (2001). With twenty-five projects, like counting tree rings, and serializing cars from photographs. Includes a project on soil types.
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