 | Term | Definition |
| |
eon |
is the longest time unit and measured in billion present of years |
| |
Uniformitarianism |
states that the process occuring today have been since earth form |
| |
superposition |
understanding of rock sequence states |
| |
unconfirmity |
missing layers in a rock |
| |
inclusion |
a buried erosional surface in the rock record |
| |
half-life |
the time it takes for -half of a radioactive element to decay |
| |
iridium in rocks at earth's surface |
evidence that a very large meteorite struck earth during the late mesozioc includes |
| |
a large impact crater in the gulf of mexico |
geological evidence that a large meteorite struck the Yucatan in the distant past includes |
| |
meteorites |
the age of earth has been dated at 4.6 billion years based upon the age of rocks from the moon |
| |
redinia |
earth's first supercontinent formed during the proterozioc Eon |
| |
red beds |
evidence that free oxygen was present the earth's atmosphere during the proterzoic is provided byt the oxidized iron |
| |
prokaryotic |
the first life-forms on earth probably were small cells |
| |
equator |
during the early palezoic, what is now north america was located near |
| |
late |
the supercontinent of Pangea formed during what Palezoic |
| |
meotrite impact |
at the end of the cretaceous period, dinosaurus became extinct, possibly as a result of |
