What can scientists learn from the rate at which radioactive elements decay?
A. a rock's absolute age*
B. the relative age of rock layers
C. where one soil horizon ends and the next begins
D. the difference between molds and casts.
The relative age of a rock is
A, its age based on how much carbon-14 it contains
B. its age compared with the ages of other rocks *
C. less than the age of the fossils it contains
D. the number of years since it formed
After six half-lives, what percentage of a radioactive sample will remain?
A. 0%-1%
B. 1%-3%*
C. 3%-6%
D. 6%-10%
Earth's oceans, atmosphere, and continents began to form during the first several hundred years of Precambrian time.
A. True*
B. False
A mold forms when minerals replace all or part of an organism.
A. True
B. False*
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Scientists can learn a rock's absolute age by determining the rate at which radioactive elements decay. The process of radioactive decay occurs at a constant rate, and by observing how much of a radioactive element has decayed, scientists can calculate the amount of time it took for that decay to occur. This can be used to determine the rock's absolute age.
The relative age of a rock refers to its age compared to the ages of other rocks. It is not based on the amount of carbon-14 it contains, which is used for dating organic material, but rather on the sequence of rock layers and the principles of stratigraphy. By studying the arrangement of rock layers and the fossils they contain, scientists can determine the relative age of different rocks.
After six half-lives, approximately 1%-3% of a radioactive sample will remain. Each half-life corresponds to a 50% reduction in the amount of radioactive material, so after six half-lives, the starting amount will have been reduced to a small fraction of its original quantity.
It is true that Earth's oceans, atmosphere, and continents began to form during the first several hundred years of Precambrian time. The Precambrian period is the longest span of time in Earth's history, and it includes the formation and evolution of these major features of our planet.
A mold does not form when minerals replace all or part of an organism. This statement is false. A mold is formed when organic material, such as a shell or leaf, decays and leaves behind an impression in sediment or rock. Minerals can then fill in this space, creating a cast or fossil replica of the original organism.