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Mechanical Weathering: Understanding Earth's Surface Changes

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Mechanical Weathering: Understanding Earth's Surface Changes

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Questions and Answers

What is the main focus of mechanical weathering?

Shaping Earth's surface through volcanic eruptions

Creating new rocks through temperature changes

Breaking down rocks using chemical reactions

Breaking down rocks using physical means (correct)

How does mechanical weathering differ from chemical weathering?

Chemical weathering occurs quickly, while mechanical weathering is slow.

Mechanical weathering is caused by volcanic activity, while chemical weathering is not.

Chemical weathering only affects soft rocks, while mechanical weathering affects hard rocks.

Mechanical weathering breaks down rocks with physical forces, while chemical weathering uses chemical reactions. (correct)

What are the main external factors in the environment that cause mechanical weathering?

Wind and soil erosion

Water and temperature changes (correct)

Volcanic eruptions and earthquakes

Chemical reactions and biological processes

How long does it typically take for noticeable changes to occur due to mechanical weathering?

Years to millions of years Signup and view all the answers

What is the eventual outcome of the process of mechanical weathering on Earth's surface features?

Erosion of boulders into sand and sediment Signup and view all the answers

What is the primary cause of thermal expansion weathering?

Temperature changes Signup and view all the answers

Why are rocks in desert climates more susceptible to thermal expansion weathering?

Extreme temperature changes Signup and view all the answers

Which type of weathering involves the force of freezing water expanding and making cracks larger within a rock?

Frost weathering Signup and view all the answers

What is the primary mechanism behind exfoliation weathering?

Pressure release Signup and view all the answers

How does thermal expansion contribute to the formation of grus fragments in desert climates?

By expanding and contracting rocks sharply Signup and view all the answers

What is the main cause of exfoliation weathering according to geologists?

Pressure decrease causing the outer layers to break Signup and view all the answers

How does abrasion weathering differ from salt crystal growth weathering?

Salt crystal growth involves rocks being forced against each other while abrasion involves crystals forming in rock cracks. Signup and view all the answers

Which of the following is NOT a living organism that can contribute to biological weathering?

Mineral salts Signup and view all the answers

What effect do salt crystals have on rocks during salt crystal growth weathering?

They push through and widen cracks in rocks. Signup and view all the answers

How can living organisms contribute to mechanical weathering of rocks?

By growing roots into rock cracks and opening them further. Signup and view all the answers