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I believe this would be the oceanic crust
a geologist
A geologist is a person who studies rocks and earth.
hydrogeologist
Such a person a geologist.
A person who learns a lot is often referred to as a scholar, a knowledgeable individual, or simply well-learned.
apprentice
I believe this would be the oceanic crust
litosphere and asthenosphere
a geologist
A geologist is a person who studies rocks and earth.
This question is somewhat vague! The middle or centre of the whole Earth is the core. However the middle of the layers from the surface to the centre of the Earth is known as the mantle.
An auditory learner
Artisan
Apprentices.
hydrogeologist
Such a person a geologist.