The world is divided in many ways for descriptive purposes. Thus, the geologist classifies the crust by describing it as oceanic or continental. They've also described and named the layers of the Earth.
fossil records
geologists
geologists
geologists
Speaking from personal experience, I am a geologist and I am alive today. However, I know that I an not alone in the world, I suspect that there are thousands of professional geologists in the world at the moment.
The plural of geologist is geologists. As in "the geologists are studying the meteor sample".
world war 2
World War 2
geologists!!! ... "biologists" not "geologists"...
Historical geologists divide the history of the earth into for units of time called Eras. The first one that began when the earth formed---- 4.6 billion years ago---- was called the Precambrian Time. The next--- after the PT--- was known as the Paleozoic Era. The third--- when dinos roamed--- was called the Mesozoic Era. The on we live in is called the Cenozoic era.
That would be a geologist? Or if you wanted a name: http://en.wikipedia.org/wiki/List_of_geologists
There are different types of geologists that study oil exploration, mineral exploration and mineral mining. There are also engineering geologists.