There are few impact craters on Venus, suggesting that the surface is, in general, geologically young - less than 800 million years old.

The region is geologically young and shows high altitudinal variation.

The landscape, as part of a geologically young mountain region with steep slopes, is naturally predisposed to mass movement.

The caves are geologically young (estimated 12,000 years) and hence there is only one tiny stalagmite.

Taranaki is geologically young, having commenced activity approximately 135,000 years ago.

These may represent tectonic activity, which would indicate that Xanadu is geologically young.

The Florida caves are formed from geologically young limestone with moderate porosity.

The entire island archipelago is geologically young, having begun to form probably less than 50 million years ago, during the Miocene era.

They are generally found in areas of volcanic activity that are geologically young.

The United States has the most active volcanoes in the world, many of them geologically young.