Weathering

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Weathering and Erosion

Erosion

Water

Ground water

Subtopic

Runoff

Young streams

Gradient

V-shaped land

steep at head; flat at mouth

slope of stream

Stream devlopment

Longitudinal Profile-the side view fom head to mouth.

Types depend on shape, speed, volume of water.

stream = any channelized flow of water

Over time, continuos hill erosion leads to the devlopment of a stream

What affects runoff?

Vegetation

Slope of land

The water content of soil

The intensity and duration of rainfall

Mass Movement

Wind

Waves

Glacier

Landforms

Fjord

U-shaped valley filled with water

Kettle lakes

ice melt in own hole

Drumlins

Mounds and hills of tills

Erratics

Large rocks; unrelated placement

Till

Pile of debris left behind; unsorted

Fingerlakes

Giant, long, deep, glacial grooves; makes lakes

Moraines

Medial

In the middle of the glacier

Terminal

Rock and debris at the furthest point the glacier has reached

Dark bands: Rocks

Usualy on the outer edge

Type

Valley or Alpine

small; in between valleys

Continental

Large; spread out like a pancake (flat suface)

Description

Huge rock conveyor belts of ice

Rate of melting = Rate of moving

parallel grooves; scratched and polished

Weathering

Break down of rock over tiime

Mechanical

Organic activity

Roots; animals

Exfoliation and unloading

Rock weathers away

Less weight and pressure

Breaks into sheets and slabs

Frost wedging

water gets in

water frezes, expands

Freeze and thaw cycles

Disintegrates; no change in composition

Physical; into smaller peices

Chemical

Acid reactions

Dissolves

Oxidation

Rust!

More surface area; more weathering