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This quiz consists of 5 multiple choice and 5 short answer questions through Part 5, Chapter 25.

Multiple Choice Questions

1. Scientists assumed stromatolites were extinct until they were discovered where in 1961?
(a) Australia.
(b) Armenia.
(c) Argentina.
(d) Algeria.

2. Invented in the 1930s, chlorofluorocarbons (CFCs) have proven to be damaging to:
(a) Refrigerator production.
(b) The ozone layer.
(c) The tourism industry.
(d) Underground caves.

3. What organisms does the author say are the most enduring inhabitants of our planet?
(a) Fungi.
(b) Bacteria.
(c) Spiders.
(d) Humans.

4. Approximately how many bacteria live on a square centimeter of human skin?
(a) 4,000,000.
(b) 100,000.
(c) 350.
(d) 7,500.

5. In the 1700s, people were finding holes in theories. For example, if the thoughts on erosion were completely correct, then:
(a) Sand would be ground to fine powder.
(b) All farmland would have been washed away.
(c) There would be no mountains, only smooth hills.
(d) Icebergs would have eroded long ago.

Short Answer Questions

1. In 1871, Lord Kelvin suggested that life on Earth started because of:

2. Who was the first person to describe a cell?

3. A hundred years before Einstein's math analyses confirmed the existence of atoms, this self-educated scientist suggested everything is made up of tiny, unchangeable particles:

4. According to the author, humans today have 625 percent more what in their bloodstream compared to previous generations?

5. Approximately how many miles are there from Earth's surface to its core?

(see the answer key)

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