6th: Weathering and Erosion

The carrying away of rock by rock particles by water, ice, wind, or gravity.

• freezing and thawing

• relief of pressure

• erosion

• acid rain

the process that breaks down rocks and other substances

• humus

• weathering

• Bedrock

• erosion

What is sediment?

• the process of rocks being broken down and carried away
• bits of rock, sand, and silt caused by the weathering of rocks
• the top layer of the soil
• decaying plant or animal material 

Which of these is an example of erosion?

• Light shinning onto a mountain

• Rain breaking down rock

• Wind blowing away sediment

• All of the above

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

• keeps the rocks in place
• makes the rocks last longer
• expands cracks and breaks rocks
• causes rocks to fall in landslides

Rain washing away soil from a hillside

• Weathering

• Erosion

• Deposition

Wind blowing sand from one location to another

• Weathering
• Erosion
• Deposition

How do plants weather rocks?

• during photosynthesis
• when roots grow into cracks of rocks and expand the rock
• when the plant moves water from the roots to the leaves
• Plants don't weather rocks

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

• chemical weathering 
• physical or mechanical weathering
• erosion
• Deposition

The process of breaking up rocks caused by CHEMICAL changes that DOES change the actual substance of the rock. 

• erosion
• Acid Rain
• Chemical Weathering
• Rocks