Title the next page in your science notebook:
“Weathering notes” & Copy the following questions into your science notebook:
• What is the difference between weathering and erosion?
• What is the difference between mechanical and chemical weathering?
• How do water, air, and organisms cause chemical weathering?
• How do mechanical and chemical weathering work together to speed up the weathering process?

• Open book to page 30, and use that chapter to write out 3 examples of chemical weathering, and

• We will be exploring several different resources, including videos, reading, games and labs to answer the questions you copied into your science notebook for today’s bell ringer.
MECHANICAL & PHYSICAL WEATHERING are the same thing

Video: “A Look at Sinkholes: Florida's Most Common Natural
Disaster ”
1. In groups: Name 2 examples of physical weathering and one example of chemical weathering?
2. Whole class; Are there substances that are not chemicals? If so, what are some examples?
After the video, you will answer the above questions in a group, then share your answers in class.

1.
During the video, write down one example of a mechanical weathering. & 1 ex of chemical weathering
SIGNS OF CHEMICAL:

Bell ringer: copy these questions
Compare & contrast the causes of cave formation and sinkhole formation.
WRITE: “Earth’s cellar”
1.
How are caves & sinkholes similar?
2.
How are they different?
3.
Which processes are physical ones and which are chemical?

Compare & contrast the causes of cave formation and sinkhole formation.
1.
How are they similar?
-both made from limestone & from water dissolving, both form via a chemical process
2. How are they different?
Sink holes form when earth’s surface collapses; caves are often larger; caves usually have a ceiling, the inside of a cave is made of rock, while a sink hole is usually soil
3. Which processes are physical ones and which are chemical?
Acidic water dissolving is a chemical process; when dirt and rock collapses in and slams into other rocks, soil, etc, that is physical weathering

WEATHERING
-
Brainstorm:
1) What is it?
2) What can cause it?
3) How does weathering change the surface of the
Earth?
Possible Causes:

1. oxidation- when iron or other metal deposits in rocks rust, they change color
1. Water and oxygen

• Weathering= the breaking down of rock into smaller and smaller pieces.
Is weathering constructive, destructive, or both?
Why?
-Weathering is destructive- it “tears down” rocks and landforms.

Brainstorm
1) What can cause each type of weatheri ng?
WEATHERING
1) Mechanical 2) Chemical
Breaking down rocks by physical means
Chemical breakdown of rock and minerals into new substances
Possible causes: Possible causes:

1. ANIMALS
Little animals also help weathering by burrowing and digging through the ground.

– when water gets into cracks of a rock, freezes & thaws over
& over again & splits the rock

3. PLANT GROWTH
• Roots of plants also push into the rocks and break them apart. They act like wedges and push the rocks apart.

WATER rubs fragments against each other and wears away the surface of the rock by abrasion.
– The faster the water, the greater the erosion

. Abrasionsediments carried by wind, water, or ice wear away rock by hitting & scraping against other rock

Wind
• sandstone shapes eroded by coastal winds
Sandblasting

WATER - rubs fragments against each other and wears away the surface of the rock by abrasion.
– The faster the water, the greater the erosion

• Ice- Glaciers
–The glacier gouges out chunks of rock and leaves scratches on the rock called striations

CHEMICAL WEATHERING
• CHEMICAL WEATHERING the chemical breakdown of rock and minerals into new substances

CHEMICAL WEATHERING
is considered to be the universal solvent. It dissolves many things – including rock
• Over time, water can break down even hard rock like granite

CHEMICAL WEATHERING
2) Oxygen
Oxidation (rust) is a chemical reaction in which an iron combines with oxygen.

CHEMICAL WEATHERING
-
3) Carbon Dioxide (CO2)
CO2 mixing with water creates Carbonic Acid that slowly dissolves limestone.
-
(Acid in groundwater)
Caves

CHEMICAL WEATHERING
4) Living Organisms
Acids from decaying plants or fungi such as lichens breaks down rocks

CHEMICAL WEATHERING
5. ACID PRECIPITATION is rain or snow that contains more acids than normal due to air pollution.
The acid “dissolves” and “eats away” the rock

How does weathering change the surface of the Earth?

Living Plant
Roots of plants also push into the rocks and break them apart
Nonliving
Animal
Ice
(glacie burrowing and digging through the ground
water gets into cracks of a rock, freezes
& thaws over & over again & splits the rock rs)
-scratches on the rock called striations
Wind
wears away the surface of the rock by abrasion
Water rubs fragments against each other and wears away the surface of the rock by abrasion.

Living Plants
Nonliving
Water
Acid rain
Groundwater
Oxidation
Acids from decaying plants or fungi such as lichens breaks down rocks universal solvent. It dissolves many things – including rock rain or snow that contains more acids than normal due to air pollution.
-acid “dissolves” or “eats away” the rock
CO2 mixing with water creates Carbonic acid that slowly dissolves limestone chemical reaction in which an element combines with oxygen to form an oxide

Weathering
1) Mechanical 2) Chemical
Living Nonliving Living
Plants Ice -
(Glaciers)
Plants
Nonliving
Water
Wind
Acid rain
Groundwater
Animals
Water Oxidation

• How are materials from the earth broken down?