2. After being hosed down, how long does it take for red-hot lava to turn black?
(a) Four weeks.
(b) A month and a half.
(c) Hours to days.
(d) Two and a half weeks.

3. Sigurdur Jonsson is an Iceland resident who works on what?
(a) Tourism.
(b) Fishing boats.
(c) Polar bear protection.
(d) Pumping crews.

4. With "City Flow" moving towards them in Heimaey, what do pumping crews do?
(a) Dismantle and move equipment to save it.
(b) Send an emergency request for more crews and equipment.
(c) Board a ship and leave.
(d) Abandon efforts and run away.

5. How much water is pumped onto a lava field directly in the path of the moving mountain headed towards Heimaey's town and harbor?
(a) Three hundred thousand gallons.
(b) Three thousand gallons.
(c) Thirty trillion gallons.
(d) Thirty million gallons.

6. On January 23, 1973, the five thousand residents of Heimaey, the only populated island of Vestmannaeyjar, are threatened by what?
(a) Flu epidemic.
(b) Cracking ice shelf.
(c) War.
(d) Lava.

7. What childhood fear does Magnus Magnusson share with the author?
(a) Helgafell will erupt.
(b) Heimaey will become a ghost town.
(c) Iceland will break in half.
(d) Vestmannaeyjar will fall into the sea.

8. After the eruptions of 1973 end, how many of Heimaey's evacuees return?
(a) All of them.
(b) Two-thirds.
(c) Half.
(d) Only a handful.

9. What do doctors dispense to workers who are cooling down the lava in Iceland to soothe their hoarse throats?
(a) Norwegian chest drops.
(b) Finnish cough drops.
(c) Icelandic throat lozenges.
(d) Swedish chest lozenges.

10. What is Thorbjorn Sigurgeirsson's idea to stop the flow of lava?
(a) Digging channels and ditches.
(b) Cooling it.
(c) Building a metal wall.
(d) Redirecting it.

11. After work crews deal with the moving mountain on Iceland's erupting island, what challenge do they face?
(a) New lava flow that threatens the town.
(b) Pumps that fail due to excessive heat.
(c) Orders from Iceland's government to stop all cooling efforts.
(d) Blinding blizzard that buries the equipment.

12. How long does the the Mauna Loa eruption of 1984 last?
(a) Thirty-three days.
(b) Three months.
(c) Thirty-three weeks.
(d) Three weeks.

13. Heimaey is considered to be an important what?
(a) Fishing center.
(b) Cultural hub.
(c) Lumber producer.
(d) Polar bear sanctuary.

14. What gives Thorbjorn Sigurgeirsson the idea to cool the oncoming flow of lava?
(a) Watching children play by the water.
(b) Stories he'd heard of ancestors doing the same.
(c) His post-graduate studies.
(d) Watching lava cool by the sea.

15. In 1973, the eruptions in Heimaey begin on January 23 and continue vigorously before diminishing in strength through when?
(a) February 25th.
(b) March 1st.
(c) January 30th.
(d) February 5th.