<human>:  Where was the last glacial maximum?
<bot>: The Last Glacial Maximum was a period of glacial advance that occurred between 21,000 and 19,000 years ago. It was a time of extreme cold in the Northern Hemisphere. The Last Glacial Maximum was caused by the Earth’s orbit around the sun changing, which caused the Earth’s axis to tilt and the Northern Hemisphere to receive less sunlight. This caused the Earth’s climate to cool and the ice sheets to grow.