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16 Cards in this Set

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Sedimentary rock

Rock that is formed by deposition of material at the Earth's surface and within bodies of water.

Igneous rock

Rock formed through the cooling and solidification of magma or lava.


Layers of sedimentary rock or soil with internally consistent characteristics that distinguish it from other layers.

Steno's Law of Superposition

In any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom.

Stratigraphic correlation

Study concerned with establishing geo-chronological relationships between different areas, based on geologic investigations of many local successions.


Variants of a particular chemical element which differ in neutron number.


The time required for half of the unstable radioactive atoms in a sample to undergo radioactive decay.

Foramen magnum

A large opening in the occipital bone of the human skull.

Supraorbital torus

A ridge on the frontal bone above the eye socket.

Sagittal crest/keel

A ridge bone running lengthwise along the midline of the top of the skull (at the sagittal suture).


Jaw protruding beyond coronal plane of the skull.


Having proportionately oversized teeth.

Occipital bun

A prominent bulge or projection of the occipital bone at the back of the skull.


The cultivating or taming of a population of organisms in order to accentuate traits that are desirable to the cultivator or tamer.


A misalignment or incorrect relation between the teeth of the two dental arches when they approach each other as the jaws close.

Enamel hypoplasia

Enamel is hard but thin and deficient in amount.