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Chapter 8 Assessment
| Question | Answer |
|---|---|
| Geologists estimate that the Earth is ___ years old. | 4.6 Billion years old |
| The principle that geologic processes that occurred in the past can be explained by current geologic processes is called____ | Uniformitariasm |
| Layers of rock, called ____, show the sequence of events that took place in the past. | Strata |
| Even though all three classes of rock can form layers, the ones most commonly studied are____ | Sedimentary Rocks |
| The boundary between two beds of rock is called a____ | Bedding Plate |
| The principle that a sedimentary rock layer is older the one above it is called the law of____ | Superposition |
| The principle that a fault or intrusion is younger than the layers it cuts through is called the law of____ | Cross Cutting |
| The absolute age of a rock layer is its___ age | Numeric |
| Using the rate of___ to determine absolute age would be less accurate for a surface feature such as the Grand Canyon which is millions of years old. | Radiometric Dating |
| In general, about 30 cm of sedimentary rock are___ over a period of 1,000 years. | deposited |
| Show sedimentary rock layers show annual layers called___ | varves |
| Which layer(summer or winter) is composed of darker, finer grains? | Winter |
| Atoms of the same element that have different numbers of neutrons are called___ | Isotopes |
| The original radioactive isotope is called the___ isotope | Parent |
| the half-life is the time required for half of a radioactive sample to break down by decay to form the___ isotope | daughter |
| What is the half-life of Uranium-238? | 4.5 billion years |
| The ages of wood, bones, shells and other organic remains embedded in rock can be determined through____ dating | Carbon |
| The scientific study of fossils is called___ | Paleontology |
| Some insects become fossilized in hardened tree sap called___ | Amber |
| Organisms buried in___ do not decay, because bacteria do not survive in low temperatures. | Ice |
| When minerals in groundwater percolate through buried organic matter, the result is a nearly perfect mineral replica of the object. This process is called___. | Petrification |
| A fossil residue of a leaf that makes a "shadow" on sedimentary rock is called a___ | Carbonfilm |
| Fossilized dung or waste is from an animal is called a___ | Caprilite |
| The stones from the digestive tracts of dinosaurs are called___ | Gastroliths |
| Fossilized tracks, borings or burrows are called___ fossils. | Trace |
| Fossils that occur only in rock layers of a particular geologic age are called___ fossils. | Index |
| Geologists also use these fossils to locate deposits of ____. | Oil |
| According to the law of cross cutting, what happened first in the diagram below?(heh) | Layer A is deposited |
| What event happened next after layer D was deposited? | Fault |
| What event happened last? | Fault |
Created by:
evansloan19
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