Post on 31-Dec-2015
Weathering and Weathering and ErosionErosion
WeatheringWeathering
The processes that break down rock The processes that break down rock into smaller pieces.into smaller pieces.
SedimentSediment Small pieces of rock Small pieces of rock
Examples of SedimentExamples of Sediment:: GravelGravel Sand Sand Silt Silt Clay Clay
Mechanical WeatheringMechanical Weathering
Occurs when rocks are broken down Occurs when rocks are broken down by physical processes. The rocks get by physical processes. The rocks get smaller, but do not change chemical smaller, but do not change chemical makeup.makeup.
Types of Mechanical WeatheringTypes of Mechanical Weathering
Plants and animals – Examples: tree Plants and animals – Examples: tree roots and burrowing animals roots and burrowing animals
Types of Mechanical WeatheringTypes of Mechanical Weathering
Ice wedging – water gets between Ice wedging – water gets between the cracks in the rocks, freezes and the cracks in the rocks, freezes and breaks them apart. breaks them apart. Example:Example: cracks in sidewalks cracks in sidewalks
Chemical WeatheringChemical Weathering
Occurs when chemical reactions Occurs when chemical reactions dissolve minerals in rocks or change dissolve minerals in rocks or change them into different minerals.them into different minerals.
Types of Chemical WeatheringTypes of Chemical Weathering
Natural acids – break down rocks.Natural acids – break down rocks.
Examples: caves; feldspar turns into Examples: caves; feldspar turns into clayclay
Types of Chemical WeatheringTypes of Chemical Weathering
Plant acids- acids are released from Plant acids- acids are released from plants and dissolve rock over time. plants and dissolve rock over time.
Ex: LichenEx: Lichen
Types of Chemical WeatheringTypes of Chemical Weathering
Oxidation - Metallic minerals exposed Oxidation - Metallic minerals exposed to water and oxygen over time. to water and oxygen over time. Example: rustExample: rust
ErosionErosion
The movement of sediment from one The movement of sediment from one place to another.place to another.
Forces of Erosion: wind, water, ice, Forces of Erosion: wind, water, ice, gravitygravity
DepositionDeposition
The laying down of sediment by The laying down of sediment by water, wind, glaciers or gravitywater, wind, glaciers or gravity
Examples: river delta, glaciersExamples: river delta, glaciers
Forces of ErosionForces of Erosion
Mass movement (mass wasting) - Mass movement (mass wasting) - erosion from gravity moving erosion from gravity moving sediment down a slopesediment down a slope
Types of Mass MovementTypes of Mass Movement
SlumpSlump – when a section of material – when a section of material slips down a slope and breaks off. slips down a slope and breaks off.
Types of Mass MovementTypes of Mass Movement
Rockfall Rockfall – pieces of rock fall and – pieces of rock fall and cause other rocks to fall. Usually cause other rocks to fall. Usually happens in happens in
the winter.the winter.
Types of Mass MovementTypes of Mass Movement
Rock slideRock slide- rocks slide down a slope - rocks slide down a slope at once. Usually happens after at once. Usually happens after heavy rain or during earthquakes heavy rain or during earthquakes
Types of Mass MovementTypes of Mass Movement
Mudflow (mudslide)Mudflow (mudslide)- rain mixes - rain mixes with soil to form mud, slides downhill with soil to form mud, slides downhill
Types of Mass MovementTypes of Mass Movement
CreepCreep- when sediment slowly shifts, - when sediment slowly shifts, trees and other objects lean forward trees and other objects lean forward
WindWind
the less vegetation, the greater the less vegetation, the greater wind can affect erosion.wind can affect erosion.
GlaciersGlaciers
as a glacier moves, sediment moves as a glacier moves, sediment moves with it causing erosion with it causing erosion
WaterWater
rivers and oceans can cause erosion rivers and oceans can cause erosion
AnimalsAnimals
Humans and other animals can Humans and other animals can impact erosion. impact erosion.
Glue these notes in your journal.Glue these notes in your journal. Be sure to label table of contentsBe sure to label table of contents Write a 1 paragraph summary of Write a 1 paragraph summary of
weathering and erosionweathering and erosion