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Question

Certain groups of fossils, which are commonly found in sedimentary rock, have been radiometrically dated and have been found to be a certain range of ages old regardless of where on earth they are found. Geologists have come to use these fossils as a marker for the relative age of the layer the fossils are found in. These types of fossils are called

trace fossils

marker fossils

index fossils

faunal fossils

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Question 3 (Multiple Choice Worth 1.0 points)

Scientists estimate the age of the universe to be

12 - 15 billion years

4.5 billion years

200 million years

45 thousand

Question 6 (Multiple Choice Worth 1.0 points)

Some atoms, such as carbon-14, whose nuclei are not stable, loose parts of their nucleus through decay. In the process they become another element. Atoms such as this are said to be ____.

half - atoms

radicals

isotonic

radioactive

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Question 7 (Multiple Choice Worth 1.0 points)

In Module 5 you looked at the Hertzsprung-Russell diagram. This diagram showed the classification of stars based on various characteristics. One classification was size and color. Which of the following would best classify, or describe, the star in our solar system - the sun?

blue giant

average, yellow, main sequence star

expanding red giant

white dwarf

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Answer 1

<<Certain groups of fossils, which are commonly found in sedimentary rock, have been radiometrically dated...>>

The question's wrong.  The fossils haven't been radiometrically dated.  Other material in the rock layers, such as volcanic ash, could have been.  Fossils can't generally be radiometrically dated.  Certain groups of fossils can be used as index fossils, but that has no direct connection with radiometric dating.  The person setting the question doesn't appear to understand the subject very well.

Answer 2

Go and read your course notes, this isn't a cheat site.