The major changes during the last 2 million years were brought about by several recent ice ages.

There have been four major ice ages in the further past.

There have been many ice ages in the history of the earth.

"The ice ages are a very strong test of whether we've got it right."

In the history of the Earth, 12 known ice ages have occurred.

More often than not over the last million years, the earth has been locked in the deep cold of ice ages.

Despite that, some new research shows just how important this basic process was during past ice ages.

Earth itself had gone through ice ages of similar duration.

In fact, there have been several ice ages, possibly many.

The causes of ice ages are complex, or hard to understand.

Some, like the people who lived in Europe during the ice ages, were big game hunters.

She claimed that, as ice ages go, this one was average.

There is a certain amount of debate as to why ice ages occur.

The great ice ages came and he used the fire to keep warm in his caves.

During the last two million years, a series of ice ages altered the landscape.

The long-term increase in the Sun's output cannot be a cause of ice ages.

Ice ages are when the world becomes much colder for a long time.

Replies: There is evidence that the earth has been having ice ages, on and off, for the last 2.5 billion years.

And remember how cold it was during the numerous ice ages we have endured?

Since then, five known ice ages have done much to remodel the region.

Please explains the medieval warm period and the 6 known ice ages?

These were formed in periods of climate change during the ice ages.

There are three or four significant ice ages during the late Neoproterozoic.

It led also to the first great ice ages.

But one thing all the experts agreed on was that they had vanished from the Earth late in the period of the ice ages.