Zircon fission track dating
Thus water in the well rises above the surrounding water table.
asphalt - A dark bituminous substance found in natural beds. asthenosphere - The highly viscous, mechanically weak region of the upper mantle of the Earth that lies below the lithosphere at depths between 100 and 200 km below the surface.
bar-finger sand - An elongated lens of sand deposited during the growth of a distributary in a delta.
The bar at the distributary mouth is the growing segment of the bar finger.
autochthonous - Refers to something formed in its present location. backwash - The return flow of water down a beach after a wave has broken.
arroyo - A steep-sided and flat-bottomed gully in an arid region that is occupied by a stream only intermittently, after rains.
artesian well - A well that penetrates an impermeable layer of rock to reach an aquifer containing water under pressure.
Geology is the scientific study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them.
The Greek derivation of the word "geology" refers only to the Earth, but since the beginning of the space age, the field has expanded to include the study of the solid matter of other celestial bodies, such as Mars and the Moon.
allochthonous - Refers to something formed elsewhere than its present location. alluvial fan - An alluvial fan is a triangular-shaped deposit of sediment at the point where a river emerges from a mountainous area and flows onto a more gently sloping plain.