The crust is the layer that can be studied directly by a geologist.
Rocks
The geologist studied the rocks from space. The geologist always stays busy by studying the different rocks.
geologist
A geologist studies rocks and the earth.
Which would usually be studied by a geologist?
Ozone layer is studied by the help of satellites or probes. They calculate the concentration of ozone in the layer.
A person who studies the Earth is called a geologist. A geologist mainly studies the origin of the Earth, its structure and composition.
to date a rock layer and other fossils within that layer
Geologist must use their knowledge of the events that disturb or remove rock-layer sequences to help piece together the history of Earth as told by the rock record.
I assume that would fall under something a geologist would study
The mesosphere is the least studied layer of the atmosphere. It is located between the stratosphere and the thermosphere and is challenging to study due to its high altitude and limited accessibility for scientific instruments.
No US president has ever been a studied geologist. Theodore Roosevelt was probably the closest. He was very interested in natural science and wrote some papers in that area. Oilmen such as the Bushes use geologists to find oil but I do not think either actually studied the subject.