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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