Science Worksheet With Answer Key - Roy G Biv
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21Name
Roy G Biv
1. The timeline below represents time on Earth from the beginning of the Paleozoic Era Ato the
present B.
Which numbered position best represents the time when humans first appeared in the fossil
record?
1 1
2 2
3 3
4
4
2. Which of the sources of energy listed below is
6. Base your answers to questions 26 and 27 on the
most nearly pollution free?
diagram below, which shows specific events in
the history of Earth from the beginning of the
1 nuclear
2
solar
universe to the present.
3 coal
4 natural gas
3. Which is the least probable source of
atmospheric pollution in heavily populated cities?
1 human activities
2 industrial plants
3
natural processes
4 automobile traffic
4. Which graph best illustrates the relationship
between lake water pollution and human
population density near the lake?
1
2
3
4
Approximately how many billion years after the
beginning of the universe did a solid crust form
on Earth?
1 0.7
2 3.9
3
9.1
4 13.7
5. What percentage of Earth's history represents
7. Radioactive decay of
atoms in an igneous
human existence?
rock has resulted in a ratio of 25 percent
1
less than 1.0%
2 1.8%
atoms to 75 percent.
and
atoms.
3 23.5%
4 more than 98.6%
How many years old is this rock?
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