ERTH 111 - exam 3
Study online at https://quizlet.com/_bjp21n
1. Lahars move downslope under the force of gravity
_________________.
2. The difference between a mud flow and a lahar is Nothing, they are the same
_________________. thing
3. Lahars move downslopes like a fast moving river of Wet concrete
_______________.
4. Lahar deposits have __________________ supported Matrix
clasts.
5. Lahar deposits grade upward from the base from small, large
___________ clasts to _____________clasts.
6. Lahars can cause fatalities for years after an erup- ash, water
tion since all you need to produce them is basically
a mixture of _______________ and __________________.
7. The source of water for lahars can be hydrothermal, rain, snow, lakes
______________________.
8. The town of Armero is in ______________________. Colombia
9. Deadly mud flows destroyed the town of Armero Nevado del Ruiz
when an eruption melted some of the snow and ice
at the summit of ________________________ volcano.
10. The death toll was higher than normal in Armero Happed at night
since the mudflows _____________________.
11. Rescue of the injured in Armero was complicated Couldn't cross the mud
because land vehicles _________________.
, ERTH 111 - exam 3
Study online at https://quizlet.com/_bjp21n
12. The death toll from mudflows in Armero was ap- 20,000
proximately ______________ people.
13. No lives would have been lost in Armero if people Been warned, had an evacua-
had _____________________________. tion plan, moved a short dis-
tance out of the river valley
14. Debris avalanches were brought to the attention Mt St Helens
of scientists after the eruption of ______________ vol-
cano.
15. Debris avalanches move downslope under the force Gravity
of _________________.
16. The town of Weed in California is built on a large Mt. Shasta
debris avalanche from ______________ volcano.
17. Debris avalanche deposits are recognized primarily Hummocky
by their _______________ topography.
18. The two depositional facies seen in debris block, matrix
avalanche deposits consist of ____________ and
______________.
19. Debris avalanches can be triggered Phreatic explosions, earth-
by____________________. quakes
20. A debris avalanche triggered the eruption of Mt St May 1980
Helens in ________________.
21. The eruption of Mt St Helens killed 56 people pri- The eruption was a directed
marily because __________________. blast to the north rather than
upward
Study online at https://quizlet.com/_bjp21n
1. Lahars move downslope under the force of gravity
_________________.
2. The difference between a mud flow and a lahar is Nothing, they are the same
_________________. thing
3. Lahars move downslopes like a fast moving river of Wet concrete
_______________.
4. Lahar deposits have __________________ supported Matrix
clasts.
5. Lahar deposits grade upward from the base from small, large
___________ clasts to _____________clasts.
6. Lahars can cause fatalities for years after an erup- ash, water
tion since all you need to produce them is basically
a mixture of _______________ and __________________.
7. The source of water for lahars can be hydrothermal, rain, snow, lakes
______________________.
8. The town of Armero is in ______________________. Colombia
9. Deadly mud flows destroyed the town of Armero Nevado del Ruiz
when an eruption melted some of the snow and ice
at the summit of ________________________ volcano.
10. The death toll was higher than normal in Armero Happed at night
since the mudflows _____________________.
11. Rescue of the injured in Armero was complicated Couldn't cross the mud
because land vehicles _________________.
, ERTH 111 - exam 3
Study online at https://quizlet.com/_bjp21n
12. The death toll from mudflows in Armero was ap- 20,000
proximately ______________ people.
13. No lives would have been lost in Armero if people Been warned, had an evacua-
had _____________________________. tion plan, moved a short dis-
tance out of the river valley
14. Debris avalanches were brought to the attention Mt St Helens
of scientists after the eruption of ______________ vol-
cano.
15. Debris avalanches move downslope under the force Gravity
of _________________.
16. The town of Weed in California is built on a large Mt. Shasta
debris avalanche from ______________ volcano.
17. Debris avalanche deposits are recognized primarily Hummocky
by their _______________ topography.
18. The two depositional facies seen in debris block, matrix
avalanche deposits consist of ____________ and
______________.
19. Debris avalanches can be triggered Phreatic explosions, earth-
by____________________. quakes
20. A debris avalanche triggered the eruption of Mt St May 1980
Helens in ________________.
21. The eruption of Mt St Helens killed 56 people pri- The eruption was a directed
marily because __________________. blast to the north rather than
upward
