ERTH 111 - Exam 3 With
Complete Solution
Lahars move downslope under the force of _________________. - ANSWER
gravity
The difference between a mud flow and a lahar is _________________. - ANSWER
Nothing, they are the same thing
Lahars move downslopes like a fast moving river of _______________. - ANSWER
Wet concrete
Lahar deposits have __________________ supported clasts. - ANSWER Matrix
Lahar deposits grade upward from the base from ___________ clasts to
_____________clasts. - ANSWER small, large
Lahars can cause fatalities for years after an eruption since all you need to
produce them is basically a mixture of _______________ and __________________. -
ANSWER ash, water
The source of water for lahars can be ______________________. - ANSWER
hydrothermal, rain, snow, lakes
The town of Armero is in ______________________. - ANSWER Colombia
Deadly mud flows destroyed the town of Armero when an eruption melted
some of the snow and ice at the summit of ________________________ volcano. -
ANSWER Nevado del Ruiz
The death toll was higher than normal in Armero since the mudflows
, _____________________. - ANSWER Happed at night
Rescue of the injured in Armero was complicated because land vehicles
_________________. - ANSWER Couldn't cross the mud
The death toll from mudflows in Armero was approximately ______________
people. - ANSWER 20,000
No lives would have been lost in Armero if people had
_____________________________. - ANSWER Been warned, had an evacuation plan,
moved a short distance out of the river valley
Debris avalanches were brought to the attention of scientists after the
eruption of ______________ volcano. - ANSWER Mt St Helens
Debris avalanches move downslope under the force of _________________. -
ANSWER Gravity
The town of Weed in California is built on a large debris avalanche from
______________ volcano. - ANSWER Mt. Shasta
Debris avalanche deposits are recognized primarily by their _______________
topography. - ANSWER Hummocky
The two depositional facies seen in debris avalanche deposits consist of
____________ and ______________. - ANSWER block, matrix
Debris avalanches can be triggered by____________________. - ANSWER Phreatic
explosions, earthquakes
A debris avalanche triggered the eruption of Mt St Helens in ________________. -
ANSWER May 1980
The eruption of Mt St Helens killed 56 people primarily because
Complete Solution
Lahars move downslope under the force of _________________. - ANSWER
gravity
The difference between a mud flow and a lahar is _________________. - ANSWER
Nothing, they are the same thing
Lahars move downslopes like a fast moving river of _______________. - ANSWER
Wet concrete
Lahar deposits have __________________ supported clasts. - ANSWER Matrix
Lahar deposits grade upward from the base from ___________ clasts to
_____________clasts. - ANSWER small, large
Lahars can cause fatalities for years after an eruption since all you need to
produce them is basically a mixture of _______________ and __________________. -
ANSWER ash, water
The source of water for lahars can be ______________________. - ANSWER
hydrothermal, rain, snow, lakes
The town of Armero is in ______________________. - ANSWER Colombia
Deadly mud flows destroyed the town of Armero when an eruption melted
some of the snow and ice at the summit of ________________________ volcano. -
ANSWER Nevado del Ruiz
The death toll was higher than normal in Armero since the mudflows
, _____________________. - ANSWER Happed at night
Rescue of the injured in Armero was complicated because land vehicles
_________________. - ANSWER Couldn't cross the mud
The death toll from mudflows in Armero was approximately ______________
people. - ANSWER 20,000
No lives would have been lost in Armero if people had
_____________________________. - ANSWER Been warned, had an evacuation plan,
moved a short distance out of the river valley
Debris avalanches were brought to the attention of scientists after the
eruption of ______________ volcano. - ANSWER Mt St Helens
Debris avalanches move downslope under the force of _________________. -
ANSWER Gravity
The town of Weed in California is built on a large debris avalanche from
______________ volcano. - ANSWER Mt. Shasta
Debris avalanche deposits are recognized primarily by their _______________
topography. - ANSWER Hummocky
The two depositional facies seen in debris avalanche deposits consist of
____________ and ______________. - ANSWER block, matrix
Debris avalanches can be triggered by____________________. - ANSWER Phreatic
explosions, earthquakes
A debris avalanche triggered the eruption of Mt St Helens in ________________. -
ANSWER May 1980
The eruption of Mt St Helens killed 56 people primarily because
