| A | B |
|---|
| fossils most often form when a dead organism is buried in sediments | true |
| states that earth processes today are similar to those that took place in the past | uniformitarianism |
| dinosaur footprints are original remains | false |
| nonconformities occur when sedimentary rocks are deposited on top of uplifted and eroded metamorphic or igneous rocks | true |
| this condition helps preserve organisms as fossils | quick burial by sediments |
| this condition helps preserve organisms as fossils | hard parts |
| this condition helps preserve organisms as fossils | protection from scavengers |
| if the same types of fossils are found in two separate rock lyers, it's likely that the two rock layers | are part of one continuous deposit |
| gaps in rock layers are called | unconformities |
| a limestone bed containing fossils that are 550 million years old is __________a bed of sandstne containing fossils that are 400 million years olf | older than |
| in a series of undisturbed rock layers where shale lies between sandstone below and limestone above, the | limestone is youngest |
| _dating uses the properties of atoms in rocks and other objects to find their ages | absolute |
| rock layers are correlated if they both contain the same ____ | fossils |
| with _dating, a rock's exact age can be dtermined | absolute |
| with ___dating a rock's age is compared to the ages of other rocks | relative |
| carbon films are formed when a thin film of carbon is left, forming a silhouette of the original organism | true |
| a __is the cavity left behind in the rock after an organisms hard part has dissolved | mold |
| fossils up to 75000 years old can be dated with ______ | carbon 14 |
| the ____parts of organisms are most likely to become fossils | hard |
| fossils are the __, imprints, or traces of once-living organisms preserved in rock | remains |
| an unconformity is a ___or rock | missing layer |
| preserved animal tracks are called __fossils | trace |
| is measured in half-lives | radioactive dating |
| the process in which one of an isoptopes neutrons breaks down into a proton and an electron and the electron leaves the atom as a beta particle | beta decay |
| fossil formed when an outline of the original organism is formed from left over carbon | carbonaceous film |
| made when sediments fill a cavity made when an object decayed and the sediments harden into rock | cast |
| the time it takes for half of the amos in anisotope to decay | half life |
| fossils of a species that lived on earth for short periods of time and were abundant and were widespread geographically | index fossils |
| states that for undisturbed rocks, the oldest rocks are on the bottom and the rocks become 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 | mold |
| the process of calculating the absolute age of a rock by measuring the amounts of parent and daughter materials in a rock and by knowing the half-life of the parent | radiometric dating |
| a process that uses the properties of atoms in rocks and other objects to find their ages | radioactive decay |
| the order of events and the relative age of rocks is determined by examining the position or rocks in a sequence | relative dating |
| gaps in rock layers that develop when agens of erosion remove existing rock layers | unconformities |
| a _______may tell a geologist when, where, and how an organism lived | fossil |
