Unit E-2 (Part 2)
Rocks and sediment being carried away.
Erosion
Is this *true* or *false* about mechanical weathering: Mechanical weathering occurs from acid rain.
FALSE
Is this *true* or *false* about mechanical weathering: Mechanical weathering occurs through rusting.
FALSE
Is this *true* or *false* about chemical weathering: Chemical weathering involves abrasion and frost wedging.
FALSE Chemical weathering does *not* involve abrasion and frost wedging - *mechanical weathering does.*
Is this *true* or *false* about weathering: Weathering only breaks down soft rocks.
FALSE Weathering can break rocks into fragments - it doesn't matter if the rocks are soft or not.
Wearing down of rocks by particles carried by wind, water, or other forces.
Abrasion
Hydrolysis
Chemical reaction between water and any substance.
Is this an example of *mechanical* or *chemical* weathering? The oxidation of minerals that contain iron.
Chemical weathering
Is this an example of *mechanical* or *chemical* weathering? Acid from plant roots break up rocks.
Chemical
Is this an example of *mechanical* or *chemical* weathering? Acid rain falling on a statue made of limestone.
Chemical
Is this an example of *mechanical* or *chemical* weathering? Limestone dissolved by carbonic acid (acid rain).
Chemical
Is this an example of *mechanical* or *chemical* weathering? Moss growing on a tombstone.
Chemical
Is this an example of *mechanical* or *chemical* weathering? Outdoor furniture made of iron rusting outside.
Chemical
Is this an example of *mechanical* or *chemical* weathering? Water underground forms caves.
Chemical
Sediment being placed in a new location.
Deposition
Carbonic acid reacts with other substances and dissolves them.
Dissolution
Repeated freezing and melting of water causes weathering.
Frost (Ice) Wedging
Is this an example of *mechanical* or *chemical* weathering? A rock breaks into pieces after falling from a cliff.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? A rock falling from a cliff.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? An animal digs a hole in a rock.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? Formation of potholes in streets during severe winters.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? Repeated freezing and thawing of water that cracks rock.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? The wedging of tree roots in granite.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? Tree roots cracking the concrete foundation of a house.
Mechanical
Is this an example of *mechanical* or *chemical* weathering? Wind blown sand makes rock smooth.
Mechanical
Rocks are broken down into smaller pieces without changing the chemical makeup of the rocks.
Mechanical Weathering
Oxidation
Oxygen and iron minerals in rock have a chemical reaction.
Mechanical Exfoliation
Pressure released causing rock to expand and peel away in layers.
Dissolution
Rain water chemically combines with CO2 in the atmosphere. The acid chemically reacts with minerals in rocks.
Name examples of erosion by gravity.
Rockfalls, landslides, slumps, mudflows, and creeps
Weathering caused by tree roots growing in cracks of rocks.
Root Wedging
What are some examples of the agents of erosion?
Running water, wind, glaciers, gravity
Chemical Weathering
The chemical makeup of rocks is changed.
Weathering
The process where rocks are chemically changed or physically broken into fragments.
Repeated heating and cooling of rock causes weathering.
Thermal expansion
Which *major* agent moves the *most* sediment?
Water
