How many ice ages do scientist estimate have occured during the last billion years?

Question

A. 3
B. 5
C. 6
D. 7

Answer 1

Some say 3, others say 7........just depends on who you are talking about or to.

Answer 2

The answer is none of the above. No one knows. The problem is that a preceding ice age largely destroys the evidence of the ice age than came before it. So, the direct geological record gets obliterated. Except for the last two ice ages prior ones have been inferred from indirect sources such as pollen layers, ice cores, sedimentation, etc. Most geologists believe that we've been in alternating hot and cold climates for the past 10-15 million years. With ice ages estimated to occur every 100,000 or so years we could have been in as many as 100 glacial periods in recent geological history. We've probably not seen the last of them.

Answer 3

i think its 7