PHYSICAL WEATHERING YEAR 8_O 1st May 2007.

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Presentation transcript:

PHYSICAL WEATHERING YEAR 8_O 1st May 2007

What is physical weathering? Entry activity Write into your book the following question. What is physical weathering? Listen to TIM & MOBY and pay attention to know the answer.

Physical weathering Physical weathering is a form of weathering responsible for the mechanical breakdown of rocks but involving no chemical change. Processes involved include: Freeze thaw- the alternate freezing and melting of ice in rock cracks or pores. Exfoliation- the alternate expansion and contraction of rocks in response to extreme changes in temperature.

Physical Weathering Physical weathering is caused by Lighting Wind Expansion Contraction Freezing of water- also called freeze thaw

Practical Investigation Title: Physical weathering investigation Aim: is to investigate Physical weathering Method: heating a rock using a Bunsen burner and then cooling with water.

Results Table Number of times heated and cooled ROCK 1 Observation 2

Conclusion From this experiment I found that when heating and cooling the…..

What do you know about PHYSICAL WEATHERING?

What do you really know...? 1 - The breaking down of rock rocks into smaller bits is called... A – erosion B – transport C – 2 - In the winter at low temperatures, water collects in cracks and … A – freezes B – melts C – the temperature increases weathering

What do you really know...? 3 - When water freezes it ________splitting the rock into smaller fragments. A – contracts B – expands C – exfoliate 4 - Rocks because ___________they expand and on cooling they __________. A – cold, contract B – hot, contract C - hot, expand