Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Sci Chapter 8 and 9
| Question | Answer |
|---|---|
| Scientists believe that the Earth is ____ years old | 4.6 billion |
| The principle that geologic processes that occurred in the past can be explained by current geologic processes is called | Uniformitarianism |
| These layers of rock show the sequence of events that took place in the past | Strata |
| The most commonly studied type of rock layer is | sedimentary |
| The boundary between two beds of rock is called a | bedding plate |
| The principle that a sedimentary rock layer is older than 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 | crosscutting relationships |
| 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 | erosion |
| In general, about 30 cm of sedimentary rock are _____ over a period of 1,000 years. | deposited |
| Some 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 |
| The ages of wood, bones, shells and other organic remains embedded in rock can be determined through | (carbon) radiometric dating |
| 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 such 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 ______. (Hint: it often happens to wood) | petrification |
| A fossil residue of a leaf that makes a "shadow" on sedimentary rock is called a | carbon film |
| Fossilized dung or waste is from an animal is called a | copriolite |
| 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 use index fossils to locate deposits of | oil and natural gas |
| What does the geologic time scale do? | Divides Earth's history into time intervals |
| Scientists are able to determine the absolute ages of most rock layers in a geologic column by using | radiometric dating |
| To determine the age of a specific rock, scientists might correlate it with a layer in a geologic column that has the same | relative position and fossil content |
| Geologic periods can be divided into | epochs |
| Precambrian time ended about ______ years ago. | 542 million |
| The most common fossils in Precambrian rock are | cynaobacteria |
| The first vertebrates appeared during the | Paleozoic Era |
| The Age of Reptiles is the name commonly given to the | Mesozoic Era |
| The first flowering plants appeared during the | Cretaceous Period |
| The Age of Mammals is the name commonly given to the | Cenozoic Period |
Created by:
Jayson Van Dam
Popular Earth Science sets