Q2: Lesson 3 | Exogenic Processes Flashcards
PROCESSES WHICH CREATE
AND MODIFY LANDFORMS
ON THE SURFACE OF THE
EARTH
geomorphic processes
Break down of rocks
exogenic processes
Transport from high
energy locations to low
energy locations
exogenic processes
Gravity-induced downslope
movement of rock material that
occurs without a geomorphic agent
mass wasting
Break down of rocks into tiny pieces
without change in their chemical
composition
PHYSICAL WEATHERING
Decomposes rock through chemical
reactions that remove ions from the
original rock
CHEMICAL WEATHERING
Erosional stripping of
overlying rocks
*UNLOADING
Removal of great weight
on the surface
*UNLOADING
Occurs when
temperature changes
rapidly
*THERMAL
EXPANSION &
CONTRACTION
Water freezes in a
crack of a rock then
expansion edges the
rock apart
*FREEZE-THAW
WEATHERING
Water with dissolved
salt accumulates at
spaces and then
evaporates, and
growing salt crystals
wedge rocks apart
*SALT CRYSTAL
GROWTH
Water molecules
attach to the
crystalline structure
of a mineral
*HYDRATION
Expands when
hydrated, shrinks when
dehydrated
*HYDRATION
Ions are released into
water or combine with
other substances to form
new materials
CHEMICAL
WEATHERING
Chemical union of
oxygen atoms with
another substance to
create a new product
*OXIDATION
Carbon dioxide + water
molecules =
carbonic
acid.
Carbon dioxide + water
molecules = carbonic
acid. Decomposes rocks
*SOLUTION AND
CARBONATION
Mineral reacts water
with to form a new
mineral that has water
as part of its crystal
structure
*HYDROLYSIS
Arid climate =
Physical
weathering
Humid climate =
Chemical weathering
presence of joints, faults, folds, &
bedding planes
*STRUCTURAL
WEAKNESS
MOVEMENT OF ROCK,
SOIL,AND REGOLITH,
DOWNWARD DUE TO GRAVITY
SLOPE MOVEMENT
Slow migration but
most persistent
CREEP
heaving process
CREEP
Most common in high
latitudes or high elevation
tundra regions
*SOLIFLUCTION
Weathering weakens
the bonds between
cliffs
falls
Large rock masses that
fall from a cliff face or
an overhanging ledge
falls
Material is pulverized
(broken down into
small powdery
fragments) and then
flows rapidly
*AVALANCHES
RAPID SLIDE OF MASS OF ROCKS, DEBRIS, MUD, LAND,
ALONG DOWNSLOPES
*SLIDES
