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?

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?

What did the nerds represent?

Questions

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?

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

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?

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.