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Chapter 8

Vocabulary words

QuestionAnswer
Geoligist estamated that the Earth is __ years old. 4.6 billion
The principle that geologic processes that occured in the past can be explained by current geologic processes is called__. Uniformitarianism
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 plane
The principle that a sedimentary rock layer is older than the one above it is called the law of __. Super Position
The principle that a fault or intrusion is younger than the layers it cuts through is called the law of __. Crosscutting
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
What is the half-life or Uranium-238? 4.5 billion
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 ___. Palentology
Some insects become fossilized in hardened tree sap called ___. Amber
Created by: ashlieschuler
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