1. 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) There would be no mountains, only smooth hills.
(c) All farmland would have been washed away.
(d) Icebergs would have eroded long ago.

2. How far away is Proxima Centauri from Earth?
(a) 390 million times farther than Venus.
(b) 120 million times farther than our sun.
(c) 100 million times farther than our moon.
(d) 700 million times farther than Mars.

3. Halley believed that once scientists figured out the distance from the sun to the Earth, they could then calculate what?
(a) Weight of Earth.
(b) Distances to distant stars.
(c) Weight of the sun.
(d) Distances to other planets.

4. The Geiger counter is a:
(a) Voltage meter.
(b) Radioactivity detector.
(c) Molecular microscope.
(d) Magnetic imager.

5. Arranged side by side, how many atoms can fit across the width of a typical human hair?
(a) Five hundred.
(b) Half a million.
(c) Five thousand.
(d) Half a trillion.

Short Answer Questions

1. 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:

2. Pluto is the first planet to be discovered by an:

3. James Hutton believed that the natural forces forming the geology of Earth are:

4. Which of the following is not a major geological era?

5. When French physicist Henri Becquerel accidentally left a packet of uranium salts on a photographic plate, what happened?

(see the answer key)

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