Weathering

Weathering

Quick Rock Cycle Review!! 

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Multiple Choice

All rocks break down into smaller material.

• True

• False

Open Ended

List the three kinds of rocks.

Weathering is...

Earth Science

Weathering

• a slow and subtle process

• a basic part of the rock cycle

• life-sustaining

• a contributer to the formation of Earth's scenery​

• a cause of deterioration​

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Multiple Choice

All materials are prone to weathering.

• True

• False

Weathering

Weathering occurs when...

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• rock is mechanically fragmented (disintegrated)

• rock is chemically altered (decomposed)

Important physcial processes that lead to the fragmentation of rock include: ​

Weathering

Mechanical Weathering

• 🎬frost wedging the mechanical breakup of rock caused by the expansion of freezing water in cracks and crevices

• 🎬 salt crystal growth sea spray or salty groundwater penetrates crevices and pore spaces in rock, as water evaporates salt crystals form, grow larger, and weaken rock by pushing apart surrounding grains or enlarging tiny cracks

• sheeting: splitting off of slablike sheets of rock

• biological activity: activites of organisms

Multiple Choice

The end result of mechanical weathering is smaller pieces from a single large piece. These smaller pieces increase the ____________ available for chemical weathering.

• surface area

• volume

• slant height

Multiple Choice

When water turns to ice by what percent does the volume increase?

• 9%

• 1%

• 100%

• 50%

Multiple Select

Select all examples of biological activity that can cause weathering.

• plant roots growing

• burrowing animals

• rocks being blasted for construction projects

• thermal energy

Multiple Choice

Which of the following could be an example of sheeting?

Reorder

Correctly order the process of salt crystal growth.

• sea spray or salty ground water penetrates crevices and pore spaces in rock

• water evaporates

• salt crystals form

• salt crystals grow larger

• rock is weakened by the pushing apart of grains or enlarging of tiny cracks

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Chemical Weathering

Weathering

​In chemical weathering the original rock decomposes into substances that are stable in the surface environment.

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The products of chemical weathering will remain essentially unchanged as long as they remain in an environment similar to the one in which they are formed.​

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Match

Match the following.

• differential weathering

• weathering

• spheroidal weathering

weathering that occurs at different rates and degrees

the disintegration and decomposition of rock at or near the Earth's surface

weathering that produces a spherical shape from an initial block shape

• weathering that occurs at different rates and degrees

• the disintegration and decomposition of rock at or near the Earth's surface

• weathering that produces a spherical shape from an initial block shape

Multiple Choice

Mechanical and chemical weathering processes usually work simultaneously in nature to reinforce each other.

• True

• False

Multiple Choice

When rock breaks into progressively smaller fragments without being altered by chemicals it is called?

• mechanical weathering

• chemical weathering

• erosion

• sheeting

Multiple Choice

This type of weathering occurs when some or all of the minerals in the rock are altered or decayed by agents like water, oxygen, carbon, and other organic acids.

• mechanical weathering

• chemical weathering

• erosion

• sheeting

Open Ended

Name one way humans have caused chemical weathering.