Erosion - Sahib
What is sediment?
Tiny pieces of rock broken off by wind or water are carried away and eventually settle in oceans or lakes. Over time, they can harden into rock.
What is the definition of weathering?
When rocks are broken down and sediment is formed because of chemical, biological, or mechanical reasons.
What are the four agents of erosion?
Water, wind, glaciers, and gravity.
What are some examples of sudden change?
Flash floods, landslides, rock slides, etc.
What is a Glacier?
A large mass of ice that is formed by snow building up over time.
True or False?
The breakdown of rock caused by living organisms such as plants, animals, bacteria, and fungi, is biological weathering.
True.
True or False: The forming of glaciers is a sudden change.
True.
What are some examples of gradual change?
Hills become lower, valleys become wider or deeper, coasts recede, soil layers are thinned or transported.
What is Frost Wedging?
This is a kind of mechanical weathering where water freezes and melts over and over, causing the rock to crack and break apart.
How do you define chemical weathering?
Chemical weathering is when a rock breaks down or disintegrates due to chemical reactions.
What is an example of water causing erosion?
Sample answer: Rivers eroding their banks
What is moraine?
Moraine is a mass of rocks transported by a moving glacier.
What is Weathering?
The way rocks form from sediments, which can happen through physical, chemical, or biological processes.
How does frost wedging occur?
Frost wedging occurs when water freezes in a crack of a rock and breaks it apart.
What is abrasion?
Abrasion is when the wind wears down rocks.
True or False?
Striation is caused by the wind.
False
Striation is caused by the movement of glaciers.
How does Erosion occur?
Natural forces like water, wind, ice, and gravity wear down soil and rocks and move them across the Earth's surface.
Is this example of weathering mechanical weathering, or chemical weathering?
Tree roots cracking the sidewalk.
This example of weathering is mechanical weathering, because there is no change in its chemicals.
What agent of erosion causes landslides?
a) Gravity b) Glacier c) Wind
The answer is a) Gravity
True or False?
Cliffs collapsing is a sudden change.
True