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