Weathering and Erosion
19turdoje
2015
By: Jenna Turdo
Weathering & Erosion
Weathering
When rocks slowly wear away.
There are 3 types:
- Physical or Mechanical
- Chemical
- Biological
the 3 types of weathering
Weathering caused by physical changes on Earth. Such as weather.
Physical or Mechanical
Chemical
When rocks weather because of chemicals.
Biological
When animals and plants wear away rocks.
Physical or Mechanical Weathering
By wind & water
Wind can blow sand particles against a rock wearing the rock. Also waves continuously wear out rocks by pounding on them.
By ice wedging
When water freezes inside the rock then the ice will expand cracking the rock.
By temperature changes
When rocks heat up they expand and when they cool down they contract and when the rock continues to expand and contract it can crack the rock.
chemical Weathering
Acid rain makes chemical weathering happen faster, then rain damages rocks.
It happens when fossil fuels escape into the air then dissolve the water in the clouds making the rain water more acidic.
When rocks brake down because of oxygen and water.
By acid rain
By oxidation
Biological weathering
As plants grow bigger roots grow into the cracks of rocks making pieces of a rock fall away.
Animals can dig into rocks making cracks in rocks bigger then splitting the rocks.
They produce chemicals that brake down the rock they are on, getting the nutrients they need.
By algae, lichens, and mosses
By plants
By animal
Erosion
When the Earth is worn away.
Erosion
Winds can blow sand grains into sand dunes making them taller, wider. or strip sand from them.
Rain carries bits of soil and washes away the other soil and rock fragments.
As glaciers move they pick up every thing in their path like rocks.
By wind
By water
By glaciers
where has weathering & Erosion OCCURRED?
The Appalachian Mountains used
to be 30,000 feet high, but now because of weathering and erosion
the tallest spot is only 6,684 feet high.
Weathering has worn down the Landscape Arch many pieces of rock have fallen from it.
where has weathering & Erosion OCCURRED? (Continued)
At Joshua Tree National Monument rounded rocks show chemical weathering.
At Bridport, Dorset in Britain, rocks also show chemical weathering that caused the formations of ledges .
