What is weathering? Exit Slip

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Complete the following questions after viewing the slideshow on weathering.

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Weathering is when rocks are broken down into smaller pieces (called sediments) by different processes. There are two categories of weathering- physical & chemical.

Weathering and erosion often happen together, but they are different processes. While weathering breaks down rock, erosion carries the sediments away to a new location.

Which is the example of weathering? *

1 point

soil from a riverbank being carried downstream

rock steps worn down by acid rain

Which is the example of weathering? *

1 point

a huge boulder transported by a glacier

a rock breaking into smaller pieces when water freezes in the cracks

Which is the example of weathering? *

1 point

soil from a cliff being washed into the ocean

a rock shattered by a larger rock that fell on it

Which is the example of weathering? *

1 point

a sharp rock in a stream slowly getting smoothed out and rounded

fragments of rock sliding down a mountain cliff

Physical weathering is when rocks break apart but do not change what they are made of (their composition). Chemical weathering may dissolve or remove a particular substance from a rock.

Which is the example of physical weathering? *

1 point

a sharp rock in a stream slowly getting smoothed out and rounded

rock steps worn down by acid rain

Which is the example of chemical weathering? *

1 point

a rock shattered by a larger rock that fell on it

a lichen (fungus) on the outside of a rock getting energy from its minerals

Physical weathering can happen in many different ways. For each example below, choose the correct type of physical weathering.

Over time a river rock goes from having rough, jagged edges to a smooth, rounded appearance. This happens due to constant water washing over the rock and other rocks traveling along the water bumping into it. Which type of physical weathering is this? *

1 point

Abrasion

Frost wedging

Root wedging

Water can seep into the cracks of rocks. When the water freezes due to cold temperatures the ice expands inside the crack, making it bigger. What kind of physical weathering is this? *

1 point

Abrasion

Frost wedging

Root wedging

Rocks can fall off of the side of a cliff due to gravity. When they do, they might hit the ground or trees, breaking into pieces. What kind of physical weathering is this? *

1 point

Abrasion

Frost wedging

Root wedging

Plants grow into the soil and can get into the cracks of rocks. As the plant continues to grow, its roots may force the rock to break apart. What kind of physical weathering is this? *

1 point

Abrasion

Frost wedging

Root wedging

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