Mechanical Weathering
define and give 2 examples of mechanical weathering
Mechanical weathering is the force of rocks being broken down or disintegration by physical force by wind,water and gravity. Examples; Rocks rolling down a slope or in a fast-moving stream rub and bump against each other, becoming smoother and more rounded.
__________ __________ is the breaking down of gravel, concrete, ect.
Biological weathering
What is the difference between gradual change and sudden change?
Gradual chnages happen very slowly over thousands of years, while sudden change happens quickly.
How do slower instrumental changes happen?
When streams and rivers carry out rock fragments.
What 3 forces contribute mechanical weather ?
Wind, water, and gravity
True or False; and why !
Acid rain contains minerals
False, it contains dissolved minerals
What are the agents of erosion?
Glaciers, gravity, wind, and water.
What happens when rock fragments rub against eachother?
They become rounded and wear down.
What other material, that we mentioned, can wedge rocks apart ?
Crystal salts
What happens when acidic rain reacts with certain rocks?
Those rocks dissolve and the acid washes it away.
What are the 3 ways that wind erosion can be slowed/ stopped ?
planting vegetation, adjusting farming techniques, and reducing soil disturbance (tillage)
How does heavy rain cause erosions?
By detaching rocks from cliffs and creating landslides.
What is the 'freeze-thaw period' ?
In early spring or during winter warm spells, the days are warm, but night time temperatures still dip below freezing.
What does chemical weathering do to some materials ?
It can weaken and dissolve some materials.
What are the 3 ways we can protect areas where landslides and rockslides happen ?
Retaining walls can be built, drainage can be improved, and dangerous slopes can be monitored.
Instead of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ mature rivers _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
1. digging deeper into their channel
2. meander while curving it’s bed