EstMedida JuntasPlanasBridas-Materiales 0220 ESRT ING A4 Drive
W-E-D Cycle ESRT PAGE 6 The water cycle aides in the Weathering-Erosion- Deposition Cycle.
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Transcript of W-E-D Cycle ESRT PAGE 6 The water cycle aides in the Weathering-Erosion- Deposition Cycle.
W-E-D Cycle ESRT PAGE 6 The water cycle aides in the
Weathering-Erosion-Deposition Cycle
Weathering
Weathering: The breaking down of material at or near the Earth’s surface
Physical Weathering
A. Physical (Mechanical) Weathering: Changes in the size and/or shape of a rock without changing the rock’s composition
1. Frost Wedging: Water in the cracks of rocks freezes
-> volume of the water increases->makes cracks larger->water melts & evaporates
->more rock is exposed-> rock begins to break apart
Physical Weathering2. Plant Action: Tiny root hairs
seek out the breaks in rocks ->roots grow and expand causing greater pressure -> breaks the rock further
3. Exfoliation: Peeling away of large sheets of loosened materials at the surface of a rock due to changes in pressure or temperature
Abrasion4. Abrasion: The physical wearing
down of rocks as they rub or bounce against each other.Five Natural Agents of Abrasion
a. Flowing water
b. Moving ice
c. Waves
d. Winds
e. Gravity
Physical Weathering in Action Visualization
In Your Own Words (10 mins) Write the definition of physical
weathering in your own words Draw 4 boxes In each box, define each type of
physical weathering in your own words, or draw an illustration of what happens during each type of weathering
Chemical Weathering
B. Chemical Weathering- Changes in the mineral composition of a rock thereby forming new substances.
1. Oxidation: Occurs when oxygen interacts chemically with minerals. The rusting of iron is an example of oxidation.
Hydrolysis/Water: Occurs when there are chemical reactions between water and minerals
A Famous Example
Dissolution/Acid3. Dissolution/Acid: Occurs when
minerals are “dissolved” over time- surface has a ‘sugary’ feel when touched. Acid rain and carbonic acid are examples of agents of dissolution.
Chemical Weathering in Action Chemical Weathering Visualization
In Your Own Words (10 mins) On the same paper as physical
weathering, but in a separate area, write the definition of chemical weathering in your own words
Draw 3 boxes In each box, define each type of chemical
weathering in your own words, or draw an illustration of what happens during each type of weathering
Gravestone: Shale
Gravestone: Granite
Gravestone: Sandstone
Gravestone: Marble
Rates of Weathering
Rates of weathering will be influenced by…
1. Exposed surface area- weathering occurs on the surface. The more surface exposed, the faster weathering will occur.
Rates of Weathering
2. Mineral composition- some minerals are more resistant than others. For example, quartz is resistant to chemical and physical weathering.
The more resistant a mineral is to weathering, the more time it takes to wear down the material.
Granite vs. Limestone
Rates of Weathering
Climatic conditions- Cold and/or dry climates favor physical weathering.
Warm and wet climates favor chemical weathering.
Frost wedging works best in areas where the temperature changes often- going from below freezing to above freezing regularly