Weathering Erosion Deposition

Weathering Erosion Deposition

The present is the key to the past

What shapes the Earth

Weathering, erosion, and deposition are processes that act together to wear down and build up the Earth's surface.  These processes have occurred over billions of years.​

What is weathering?

• Weathering is a process that BREAKS DOWN rocks and creates sediments.

• Sediments refer to small pieces of rocks​.

• Two types of weathering: Chemical and Mechanical​.

Multiple Choice

What is Weathering?

• When it rains or snows.

• Process of breaking down of rocks into smaller pieces.

• Process of moving small pieces of rocks.

• Process of laying down small pieces of rocks.

Multiple Choice

What types of weathering are there?

• Mental & Astronomical

• The rainy type

• Sedimentary & Metamorphic

• Chemical & Mechanical

Multiple Choice

What is a sediment?

• chemical reaction

• pollution

• tiny pieces of weathered rock

Chemical Weathering

• Chemical weathering is the decomposition of rock caused by chemical reactions. This creates new compounds. 

• Agents of chemical weathering: water, oxygen, acid, organism

Mechanical Weathering

• Mechanical weathering is the process of breaking big rocks into little ones without changing the chemical composition of a rock.

• ​The most common type of mechanical weathering is the constant freezing, and thawing of water.

• As water freezes, it expands, becoming about 10% larger than it was in liquid form.

• Temperature changes also effect mechanical weathering. As temperatures heat up, the rocks expand.

• As the temperatures cool down, rocks contract. 

Multiple Choice

What type of weathering is it when acid rain breaks down and changes the rock.

• Chemical weathering

• Mechanical weathering

• Astronomical weathering

• Physiological weathering

Multiple Choice

Freezing water is expanding, causing the crack in the rock to widen (frost action). What kind of weathering is this?

• Chemical weathering

• Mechanical weathering

Multiple Choice

How does freezing water cause the weathering of rocks? The freezing water—

• keeps the rocks in place

• expands cracks and breaks rocks

• makes the rocks last longer

• causes rocks to fall in landslides

Multiple Choice

Statue of Liberty has changed colors over time because oxygen has caused the surface of the copper it is made of to change into a new chemical (just like copper pennies turn green). What kind of weathering is this?

• Chemical weathering

• Mechanical weathering

Erosion

• Erosion-natural forces MOVE rock and soil to another place.

• Natural forces such as gravity, running water, glaciers, waves and wind cause erosion.​

• Weathering is the breaking down of rocks while erosion is the process of moving those pieces.

Open Ended

What is the difference between weathering and erosion?

Deposition

• Deposition-occurs when sediment is LAID DOWN. 

• So erosion moves sediments and deposition lays it down somewhere else.

Open Ended

What is the difference between erosion and deposition.