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Unit 4 Vocabulary

Across
a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself
rock layers are deposited sequentially, with the oldest on the bottom and the youngest on the top
the time taken for the radioactivity of a specified isotope to fall to half its original value
the science of determining the relative order of past events
the weather conditions prevailing in an area in general or over a long period
the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes
the study of the origin, evolution, and eventual fate of the universe
expressing contempt or disapproval
belief in the existence of a god or gods
the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryos and fetuses
a theory that states that knowledge comes only or primarily from sensory experience
Down
the process of determining an age on a specified chronology in archaeology and geology
The breakdown of a radioactive isotope into a stable isotope of the same element or of another element
A long cylinder of ice that scientists drill out of icecaps
a philosophical viewpoint according to which everything arises from natural properties and causes, and supernatural or spiritual explanations are excluded or discounted
the science that deals with the earth's physical structure and substance, its history, and the processes that act on it
the theory that changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events
gaps in the geologic record that may indicate episodes of crustal deformation, erosion, and sea level variations
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
an unvarying condition in a physical process, especially as in the theory that the universe is eternal and maintained by constant creation of matter