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Constructive and Destructive Forces

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by

Christina Wolf

on 6 December 2013

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Transcript of Constructive and Destructive Forces

Constructive Forces
Geological process
that builds up the land.
-Deposition
-Deformation
-Volcanic eruptions
Constructive and Destructive Forces
Destructive Forces
geological process that
destroys land
-Weathering
-Erosion
Deposition
-laying down sediments
from erosion
Examples: deltas, hills,
sedimentary rocks, alluvial
fans, moraines, and
sand dunes
delta-sediment deposited
where a rivers flow
Alluvial Fan-
wide, sloping deposit of
sediment formed where
a stream leaves a mountain range
Sand Dunes: created by wind depositing sediments
Moraine: formed by
glaciers depositing
sediments
Forming a sedimentary rock
Deformation:
a change in
shape or dimensions of
crust, resulting from
stress.
Volcanic Activity:
creates new crust
when lava cools
Weathering
process of breaking
down rock into
smaller pieces
Erosion:
the geological process that moves weathered rock or soil.
4 Agents:
-wind, water, ice, and gravity
Mechanical Weathering
Physically breaks down rock into smaller pieces
-Happens slowly but can eventually wear down a mountain
Chemical Weathering
breaks down rock through
chemical changes
examples:
water, oxygen, acid
Acid: water combines with carbonic dioxide to creates stalacites and stalagmites in this cave made out of limestone
oxidation- oxygen combines with iron to change the color the rocks

Water: weakens rocks and breaks
their bond
Water: rain, river, oceans, waves carry sediments away
Wind carries sediments away
Ice: glaciers carry sediments
Gravity: carrying sediments down a slope
Mudslide
Creep
Plant Growth: Roots of trees break rocks
Frost Wedging: waters volume increases when it freezes which can break rocks
Release of Pressure:
when pressure is reduced by erosion it can cause the rock to flake and crack.

Animal Actions:
burrowing animals
loosen soil and break
rocks apart

Abrasion-grinding of rock by rock particles carried by wind, water, ice, or gravity.
Full transcript