WED lesson

Weathering and Erosion

Notes

We will describe how landforms

change.

I will be able to differentiate
between weathering , erosion,

and deposition

Weathering

Notes

Let’s get Nerdy

1. Put a couple of nerds in your mouth, but DO

NOT CHEW them. Observe and note what
happens to the nerds in your notebook.

2. Turn and tell your partner what happened

when I say GREENLIGHT

Questions

1. What happened when you just put

the nerd in your mouth but did not
chew?

Open Ended

What happened when you just put the nerds in your mouth but did not chew?

Let’s get Nerdy

1. Put a couple of nerds in your mouth and

chew them. Observe and note what
happens to the nerds in your notebook.

2. Turn and tell your partner what

happened when I say GREENLIGHT

Questions

1. What happened when you chewed

the nerds?

Open Ended

What happened when you chewed the nerds?

What did the nerds represent?

Questions

Poll

What do you think the nerds represents?

• Water in the ecosystem

• Rocks getting broken down over time

Two types of Weathering:
Mechanical Weathering and Chemical Weathering

Two Types of Weathering

1. MECHANICAL WEATHERING –
Physical processes that break rock into

fragments or smaller pieces

Examples:
1. Plant Roots
2. Burrowing Animals

3. Ice Wedging - occurs when water enters

cracks of rocks, freezes and expands, and
breaks rock apart.

Mechanical - Plant Roots

Mechanical – Burrowing Animals

Mechanical – Ice Wedging

Two Types of Weathering

• 2. CHEMICAL WEATHERING –
Chemical reactions dissolve minerals in

rocks or change them into different
minerals.

• Example: Dissolving - chemical process that

occurs when chemicals break down roock

Chemical – Dissolving

 Dissolved carbon dioxide in rainwater or in moist air forms carbonic acid, and this acid reacts with minerals in rocks.

​Caves are formed by Chemical Weathering!

Question 1

What is the

difference between

mechanical and

chemical

weathering?

Multiple Choice

What is Mechanical Weathering?

• Chemical process that breaks down rocks into smaller pieces

• Physical Process that breaks rocks into fragments

Multiple Choice

What is chemical Weathering?

• Chemical  reactions dissolve minerals in rocks or change them into different minerals.

• Physical processes that break rock into fragments or smaller pieces

Multiple Select

What are some examples of Mechanical Weathering?

• Plant roots

• dissolving

• Burrowing animals

• Ice wedging

Multiple Choice

What is an example of Chemical Weathering?

• Ice Wedging

• Dissolving

• Plant Roots

• Animal Burrowing

Checkpoint

What effect will weathering have on the mountain?

Erosion and
Deposition

Notes

Wind Simulator

1. What happened to the sand when

Ms. Holmes blew on it with the straw?

Questions

4 Agents of Erosion:
1. Wind
2. Water
3. Gravity
4. Glaciers

Open Ended

What are the 4 agents of erosion? Please list then submit.

Note: Weathering has to happen before
erosion. The rocks have to be broken
into smaller sediments before they can
be eroded away.

Where did the sand end up? Did it change
location or positions?

Questions

Process in which erosion stops
when the moving particles settle on a surface

What is Deposition?

Multiple Choice

What is the process in which erosion stops?

• Weathering

• Erosion

• Deposition

Multiple Choice

What is the process of sediment being moved by water, wind, or ice?

• Weathering

• Erosion

• Deposition

Closure(Explain your answers)

Q. What is the process that picks up and moves
weathered rocks?

A. Erosion B. Weathering C. Deposition

Q. Deposition changes the Earth’s surface because
bits of broken rock and soil _____.

A. stop rivers from flowing. B. are dropped in new

places.

C. move very slowly.

Multiple Choice

What is the process that picks up and moves weathered rocks?

• Erosion

• Weathering

• Deposition

Multiple Choice

Deposition changes the Earth's surface because bits of broken rock and soil_________.

• Stops rivers from flowing

• Are dropped in new places

• Move very slowly