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Weathering
Two Types of Weathering:
1) Physical or Mechanical
Weathering
 Definition-
the process that breaks rocks
apart without changing their chemical makeup.
Physical/Mechanical Weathering
Questions
 Physical
weathering is the actual breaking
down of _________ by ________________.
 The most common cause of weathering is the
____________ and ____________ of water.
 Liquid water (expands/contracts) when it
turns to solid ice.
 List two examples of physical weathering.
2) Chemical Weathering
 Definition-
occurs when chemical reactions
dissolve minerals in rocks or change them into
different minerals.
 Examples: rust, tarnishing, plant acids, oxidation
Chemical Weathering
Questions
 One
common example of chemical weathering
is______________.
 The dark red substance on the nail is called
_____________.
 Rust is oxidized _________.
 A plant called ___________ causes chemical
weathering by secreting an _________ that
dissolves rock.
Definition- The process in which
surface materials are worn away and
transported from one place to
another by agents such as gravity,
water, wind, and glaciers
Erosion
Questions
 List
the 4 natural forces that cause erosion.
 Which
one is the most powerful?
 Which
of the 7 Wonders of the World were caused
by erosion?
 What
part of oceans can cause extensive erosion?