MECHANICAL
WEATHERING
dissolving in water
 blowing sand in animals burrowing
a desert
abrasion
acid precipitation
wind, water,
gravity
temperature
 rocks in a river
acid in ground
water
 tree roots growing
into cracks
acids in living
things
ice
plant
 ice wedging
 rock slide
 rocks turning
red from rust
 caves forming
CHEMICAL
WEATHERING
oxidation
 lichen growing
on a rock