Geology Exam 3 GE2000 Questions and Answers
Troposphere - Answer-Warmest layer, relatively unstable
Stratosphere - Answer-Dry, stratified, warming due to ozone reactions
Mesosphere - Answer-Coldest layer
Thermosphere - Answer-Increased temperature due to interaction of ions with solar wi...
Stratosphere - Answer-Dry, stratified, warming due to ozone reactions
Mesosphere - Answer-Coldest layer
Thermosphere - Answer-Increased temperature due to interaction of ions with solar
wind
Volcanic eruptions cause temporary cooling of climate: - Answer-- large eruptions place
ash and SO2 into the stratosphere
- SO2 chemically converts to sulfuric acid aerosol droplets that reflect solar radiation
Mud flows (Lahars) and Debris Flows - Answer-avalanches or flows of earth debris
(rocks, soil, trees, mud, sand, ash) mixed with various amounts of water
Mud flows - Answer-Volcanoes are prone to ___ because of the amount of loose,
unconsolidated material that collects on the steep flanks of volcanoes.
following topography - Answer-hazardous areas are predictable by ___ ___.
Volcanic Gases are usually not a human health hazard because - Answer-gases usually
rise and gases dilute (mix with ambient air) with distance, unless it doesn't...
Controlled de-gassing of Lake Nyos - Answer-after 1986 CO2 "Eruption" from Lake
Nyos which killed 1700 people and hundreds of animals
How do we compare the size of volcanic eruptions? - Answer-Volcanic Explosive Index:
Plume Height, Volume, How often..
glacier - Answer-a large, long-lasting mass of ice formed on land, that moves downhill
under its own weight
1/10 - Answer-Glaciers currently cover about ___ of the Earth's surface
, 75% - Answer-About ___ of the world's supply of fresh water is locked up in glacial ice
Types of Glaciers - Answer-Alpine glaciation, continental glaciation, valley glacier, and
ice sheet
Alpine glaciation - Answer-found in mountainous regions
continental glaciation - Answer-exists where large part of a continent is covered by
glacial ice
valley glacier - Answer-confined to a valley and flows from a higher to a lower elevation
ice sheet - Answer-a mass of ice that is not restricted to a valley but covers a large area
of land
Formation of Glaciers - Answer-Glaciers develop as snow, is compacted to granular
snow and recrystallized, first into firn snow and then glacial ice (fine-grained ice to
coarse grained ice)
glaciers can only form - Answer-where more snow accumulates during the winter than
melts away during the spring and summer
Glacial Ice = - Answer-metamorphic "rock"
gravity - Answer-is the driving force for movement of glacial ice
weight, 60 - Answer-Ice cannot support its own ___ and yields to plastic flow. Movement
begins at a thickness of about __ meters.
Two Essential Parts to Glaciers - Answer-Zone of Accumulation and Zone of Ablation
advancing glacier - Answer-gains more snow than it loses, has a positive budget
terminus (end) of advancing glacier - Answer-advances downslope
receding glacier - Answer-negative budget
Terminus of receding glacier - Answer-shrinks back upslope
zone of accumulation - Answer-Snow is added to glacier
zone of ablation - Answer-melting and calving of icebergs
equilibrium line (firn line) - Answer-separates accumulation and ablation zones, will
advance or retreat depending on climate
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