Question

During the past 100,000 years, there were at least ___ glacial periods.

Answer 1

There were at least 17 cycles between glacial and interglacial periods.

Step-by-step explanation:

the glacial periods lasted longer than the interglacial periods. The last glacial period began about 100,000 years ago and lasted until 25,000 years ago. Today we are in a warm interglacial period.