Question 1

When do point-release avalanches commonly occur?

Accepted Answer

After a heavy snowfa

Question 2

What happens to snow that falls on slopes steeper than about 60 degrees?

Accepted Answer

It sluffs

Question 3

Point-release avalanches

Accepted Answer

A)  occur at the heads of valleys and widen as they travel down-valley. 
B)  occur when several small avalanches from different points converge into a larger avalanche. 
C)  begin with a small avalanche of snow, which causes adjacent failures as it moves downslope. 
D)  begin when icy slabs fall off steep cliffs and pick up more snow as they travel downslope. 
E)  erode the snow away to the rock underneath, leaving V-shaped snow valleys. 
A)  occur at the heads of valleys and widen as they travel down-valley. 
B)  occur when several small avalanches from different points converge into a larger avalanche. 
C)  begin with a small avalanche of snow, which causes adjacent failures as it moves downslope. 
D)  begin when icy slabs fall off steep cliffs and pick up more snow as they travel downslope. 
E)  erode the snow away to the rock underneath, leaving V-shaped snow valleys.

Question 4

Which of the following structures are designed to slow avalanches?

Accepted Answer

A)  avalanche sheds 
B)  mounds 
C)  berms 
D)  splitting wedges 
E)  snow fences 
A)  avalanche sheds 
B)  mounds 
C)  berms 
D)  splitting wedges 
E)  snow fences

Question 5

Wet avalanches

Accepted Answer

A)  do not achieve the high velocities of some dry avalanches. 
B)  may displace air causing a damaging air blast. 
C)  only occur at low elevations. 
D)  generate a cloud of powdered snow. 
E)  are less dense than dry avalanches. 
A)  do not achieve the high velocities of some dry avalanches. 
B)  may displace air causing a damaging air blast. 
C)  only occur at low elevations. 
D)  generate a cloud of powdered snow. 
E)  are less dense than dry avalanches.

Question 6

There have been no avalanche related fatalities in eastern Canada.

Accepted Answer

A) True 
 B)False

Question 7

Describe the natural service functions of snow avalanches.

Accepted Answer

Snow avalanches are a natural

Question 8

What is the primary force that drives an avalanche?

Accepted Answer

Avalanches

Question 9

Avalanches rarely initiate in tree-covered areas.

Accepted Answer

A) True 
 B)False

Question 10

Currently,Canada has no consistent policies delineating snow avalanche hazard zones.

Accepted Answer

A) True 
 B)False

Question 11

In the "snow belts" of central North America,the source of water vapour for the snowfall is

Accepted Answer

A)  the Pacific Ocean. 
B)  the Atlantic Ocean. 
C)  Hudson Bay. 
D)  the Great Lakes. 
E)  the Arctic Ocean. 
A)  the Pacific Ocean. 
B)  the Atlantic Ocean. 
C)  Hudson Bay. 
D)  the Great Lakes. 
E)  the Arctic Ocean.

Question 12

What is the most common trigger for avalanches in recreational accidents?

Accepted Answer

A)  a person's weight added to a slope that is near failure 
B)  daytime heating of the upper snowpack, which weakens the near-surface layer 
C)  inflow of warm air funneled upward from a valley, weakening the near-surface layer 
D)  skiers deliberately attempting to release unstable snow before they ski down a slope 
E)  bad weather 
A)  a person's weight added to a slope that is near failure 
B)  daytime heating of the upper snowpack, which weakens the near-surface layer 
C)  inflow of warm air funneled upward from a valley, weakening the near-surface layer 
D)  skiers deliberately attempting to release unstable snow before they ski down a slope 
E)  bad weather

Question 13

Slab avalanches are usually more dangerous than point avalanches.

Accepted Answer

A) True 
 B)False

Question 14

What human activities are likely to increase the snow avalanche hazard in the future?

Accepted Answer

A)  increased use of remote areas for winter recreation 
B)  increased use of off road vehicles 
C)  development on snow fields 
D)  increased hunting in mountainous areas 
E)  deforestation 
A)  increased use of remote areas for winter recreation 
B)  increased use of off road vehicles 
C)  development on snow fields 
D)  increased hunting in mountainous areas 
E)  deforestation

Question 15

If you were planning for a backcountry trip in an avalanche-prone region,what safety equipment would you take with you? Describe the use of each piece of equipment.

Accepted Answer

Shovel-for digging out another member of

Question 16

The most dangerous snow avalanches occur on slopes at angles greater than 60 degrees.

Accepted Answer

A) True 
 B)False

Question 17

Describe the slope angle for which avalanche frequency is rare.

Accepted Answer

Avalanches are rare

Question 18

If you were skiing in the backcountry,which of the following observations would indicate the highest local snow avalanche risk?

Accepted Answer

A)  steep, rocky slopes (greater than a 60 degree angle) 
B)  boulders exposed through the snow surface 
C)  compacted icy conditions that indicate no recent snowfall 
D)  thick snow on a sheltered lee slope 
E)  a fresh dusting of snow over an icy layer on a steep slope 
A)  steep, rocky slopes (greater than a 60 degree angle) 
B)  boulders exposed through the snow surface 
C)  compacted icy conditions that indicate no recent snowfall 
D)  thick snow on a sheltered lee slope 
E)  a fresh dusting of snow over an icy layer on a steep slope

Question 19

Why does the amount of snow on the ground vary considerably over short distances?

Accepted Answer

Wind redistributes t

Question 20

In general,snowfall is rare

Accepted Answer

A)  at low elevations. 
B)  on shallowly inclined slopes. 
C)  on north facing slopes. 
D)  at low latitudes. 
E)  around the Great Lakes. 
A)  at low elevations. 
B)  on shallowly inclined slopes. 
C)  on north facing slopes. 
D)  at low latitudes. 
E)  around the Great Lakes.

When do point-release avalanches commonly occur?

What happens to snow that falls on slopes steeper than about 60 degrees?

Point-release avalanches

Which of the following structures are designed to slow avalanches?

Wet avalanches

There have been no avalanche related fatalities in eastern Canada.

Describe the natural service functions of snow avalanches.

What is the primary force that drives an avalanche?

Avalanches rarely initiate in tree-covered areas.

Currently,Canada has no consistent policies delineating snow avalanche hazard zones.

In the "snow belts" of central North America,the source of water vapour for the snowfall is

What is the most common trigger for avalanches in recreational accidents?

Slab avalanches are usually more dangerous than point avalanches.

What human activities are likely to increase the snow avalanche hazard in the future?

If you were planning for a backcountry trip in an avalanche-prone region,what safety equipment would you take with you? Describe the use of each piece of equipment.

The most dangerous snow avalanches occur on slopes at angles greater than 60 degrees.

Describe the slope angle for which avalanche frequency is rare.

If you were skiing in the backcountry,which of the following observations would indicate the highest local snow avalanche risk?

Why does the amount of snow on the ground vary considerably over short distances?

In general,snowfall is rare

Introduction to Natural Hazards

Internal Structure of Earth and Plate Tectonics

Earthquakes

Tsunamis

Volcanoes and Volcanic Eruptions

Landslides

Subsidence and Soil Expansion and Contraction

River Flooding

Atmosphere and Severe Weather

Hurricanes and Extratropical Cyclones

Waves, Currents, and Coastlines

Wildfires

Climate Change

Meteorite Impacts and Extinctions

Filters

Exam 7: Snow Avalanches

When do point-release avalanches commonly occur?

What happens to snow that falls on slopes steeper than about 60 degrees?

Point-release avalanches

Which of the following structures are designed to slow avalanches?

Wet avalanches

There have been no avalanche related fatalities in eastern Canada.

Describe the natural service functions of snow avalanches.

What is the primary force that drives an avalanche?

Avalanches rarely initiate in tree-covered areas.

Currently,Canada has no consistent policies delineating snow avalanche hazard zones.

In the "snow belts" of central North America,the source of water vapour for the snowfall is

What is the most common trigger for avalanches in recreational accidents?

Slab avalanches are usually more dangerous than point avalanches.

What human activities are likely to increase the snow avalanche hazard in the future?

If you were planning for a backcountry trip in an avalanche-prone region,what safety equipment would you take with you? Describe the use of each piece of equipment.

The most dangerous snow avalanches occur on slopes at angles greater than 60 degrees.

Describe the slope angle for which avalanche frequency is rare.

If you were skiing in the backcountry,which of the following observations would indicate the highest local snow avalanche risk?

Why does the amount of snow on the ground vary considerably over short distances?

In general,snowfall is rare

Introduction to Natural Hazards

Internal Structure of Earth and Plate Tectonics

Earthquakes

Tsunamis

Volcanoes and Volcanic Eruptions

Landslides

Subsidence and Soil Expansion and Contraction

River Flooding

Atmosphere and Severe Weather

Hurricanes and Extratropical Cyclones

Waves, Currents, and Coastlines

Wildfires

Climate Change

Meteorite Impacts and Extinctions

Filters