Download Slide 1

Define WEATHERING
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
8
0
20
160
90
150
170
100
110
1
This screen will disappear in 3 minutes.
Seconds
Remaining.
A natural process that causes
rocks to change, breaks them
down, and causes them to
crumble. Freezing and thawing,
oxygen in the air, and even plants
and animals can affect the
stability of rock.
What types of things can
cause mechanical
weathering?
This screen will disappear in 3 minutes.
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
20
160
90
150
170
100
110
180
Seconds
Remaining.
Wind
Rain
Ice
Plants
What is ICE WEDGING?
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
8
0
20
160
90
150
170
100
110
1
This screen will disappear in 3 minutes.
Seconds
Remaining.
A freezing and thawing cycle that breaks up
rocks. When it rains or snow melts, water seeps
into cracks in rocks. If the temperature drops
below freezing, ice crystals form. As the crystals
grow, they take up more space than the water
did because ice is less dense than water. This
expansion exerts pressure on the rocks. With
enough force, the rocks will crack further and
eventually break apart
Describe how chemical weathering
differs in moist and dry climates?
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
8
0
20
160
90
150
170
100
110
1
This screen will disappear in 3 minutes.
Seconds
Remaining.
It is rapid in tropical regions
where it's moist and warm most
of the time. Because desert
areas have little rainfall and
polar regions have low
temperatures, chemical
weathering occurs slowly in
these areas
Describe the relationship between
weathering and soil formation.
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
8
0
20
160
90
150
170
100
110
1
This screen will disappear in 3 minutes.
Seconds
Remaining.
Weathering breaks rock into smaller
and smaller pieces, such as sand, silt,
and clay. These smaller, loose pieces
are called sediment. The terms sand,
silt, and clay are used to describe
specific sizes of sediment. Sediment
then changes gradually into soil. The
formation of soil depends upon the
amount of weathering that occurs in a
specific place.
Define mechanical weathering and
describe its causes.
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
8
0
20
160
90
150
170
100
110
1
This screen will disappear in 3 minutes.
Seconds
Remaining.
Mechanical weathering occurs when rocks
are broken apart by physical processes.
This means that the overall chemical
makeup of the rock stays the same. Each
fragment has characteristics similar to the
original rock. Growing plants, burrowing
animals, and expanding ice are some of the
things that can mechanically weather rock.
These physical processes produce enough
force to break rocks into smaller pieces.
Define chemical weathering and
describe its causes.
140
120
130
30
40
50
60
70
10
2
3
4
5
6
7
8
9
0
180
8
0
20
160
90
150
170
100
110
1
This screen will disappear in 3 minutes.
Seconds
Remaining.
Chemical weathering occurs when
chemical reactions dissolve the
minerals in rocks or change them
into different minerals. This type of
weathering changes the chemical
composition of the rock, which can
weaken the rock.