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29 Cards in this Set

  • Front
  • Back
If the same type of fossils are found in two separate rock layers, it's likely that the two rock layers
are part of one continuous deposit
Gaps in rock layers are called
Determining the order of events and the relative age of rocks by examining the position of rocks in a sequence is called ...
relative dating
Dinosaur footprints are
trace fossils
If the same sequence of rock layers is observed over a large area,
a large deposit of rock formed over a large area
Carbon films are formed when a thin layer of _________ is left, forming a silhouette of the original organism.
A ______ may tell a geologist when, where, and how an organism lived.
A _______ is the cavity left behind in the rock after an organism's hard part has dissolved.
Fossils up to 75,000 years old can be dated with __________.
carbon 14
The _______ parts of organisms are likely to become fossils.
The _______ parts of organisms are likely to become fossils.
The _______ parts of organisms are likely to become fossils.
_____ is measured in half-lives.
radioactive decay
Preserved animal tracks are called ______ fossils
Fossils are the _______, imprints, or traces of once-living organism preserved in rock.
An unconformity is a _______ of rock.
missing layer
Where can original remains be preserved?
ice, tar, amber
Rock layers are correlated if they both contain the same _______.
_______ dating uses the properties of atoms in rocks and other objects to find their ages.
made when sediments fill in a cavity made when an object decayed and the sediments harden into rock
fossils of species that lived on Earth for short periods of time and were abundant and widespread
index fossils
states that for undisturbed rocks, the oldest rocks are on the bottom and the rocks become younger and younger toward the top
principle of superposition
hollow place in rock made when an organism died and was buried and holes in the rock let air or water reach it and dissolve the organism
a process that uses the properties of atoms in rocks and other objects to find their ages
radioactive decay
fossil formed when an outline of the original organism is formed from left over carbon
carbonaceous film
states that Earth processes today are similar to those that took place in the past
gaps in rock layers that develop when agents of erosion remove existing rock layers
the process in which one of the isotope's neutrons breaks down into a proton and an electron and the electron leaves the atom as a beta particle
beta decay
the time it takes for half of the atoms in an isotope to decay