Easy money.
just a sink Below surface (grade) sink
Gold found on the surface is called alluvial gold.
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An intrusive igneous rock.
I would call this convection currents in the mantle.
An intrusive igneous rock.
extrusive
Molten material below the surface of the Earth is called magma. It consists of molten rock, gases, and suspended solids. Magma can eventually erupt onto the Earth's surface as lava through volcanic activity.
The folds on the surface of the brain are called gyri.
A submarine is a ship that can travel underwater.
Magma is the term applied to molten rock beneath the surface of the earth. It is formed when hot (very hot) rocks experience a drop in surrounding pressure, or when subducted wet lithosphere is introduced into the mantle. When it "breaks out" onto the surface of the earth, we call it lava. A link can be found below.