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2.01 weathering

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2.01 weathering 2.01 weathering Presentation Transcript

  • How do landforms change over time? Water, ice, wind and gravity play a big role in the formation and change of our earth’s landforms.
  • What Change? All of the land on earth is constantly changing. Most of these changes happen slowly over hundreds or even thousands of years. Some of these changes happen quickly.
  • Weathering Weathering is the process of breaking down rock. Over time weathering turns rock into soil. Water, ice, wind and gravity all cause weathering.
  • Weathering
  • Weathering Whenever a rock surface is exposed, weathering takes place.
  • Weathering Whenever a rock surface is exposed, weathering takes place. Look at this picture, where is weathering taking place?
  • Weathering Whenever a rock surface is exposed, weathering takes place. Look at this picture, where is weathering taking place? The water in the stream is slowly weathering the rock it flows past.
  • Weathering Whenever a rock surface is exposed, weathering takes place. Look at this picture, where is weathering taking place? The water in the stream is slowly weathering the rock it flows past. The tree roots are slowly weathering the soil around them.
  • Weathering Whenever a rock surface is exposed, weathering takes place. Look at this picture, where is weathering taking place? The water in the stream is slowly weathering the rock it flows past. The tree roots are slowly weathering the soil around them. The wind is weathering the rocks near the surface.
  • Weathering Whenever a rock surface is exposed, weathering takes place. Look at this picture, where is weathering taking place? The water in the stream is slowly weathering the rock it flows past. The tree roots are slowly weathering the soil around them. The wind is weathering the rocks near the surface. If rain fell, the rain would push some rocks and soil into the stream.
  • Water Moving water is a common cause of weathering. As water flows past rock, it wears away tiny particles of the rock’s surface. Over time, a stream that is moving quickly, can cut deep into rock. Rain falling from the sky also causes weathering. As the water flows downhill, it weathers all of the surfaces it comes in contact with.
  • Ice Water often seeps into tiny cracks and dents in rock. If it freezes (below 32 degrees F) the water will expand, it causes cracks in rock. If it freezes again, it will cause even more cracks. The cracks in the rock will break rock down into smaller pieces over time.
  • Wind Wind often carries small particles of sand and soil. As these small particles blow over rocky surfaces, they scrape them. Abrasion is what we call the grinding away of rock by sand particles or other rock. Wind causes abrasion, and so does water when it carries sand and rocks that scrape against other rocks.
  • Gravity Gravity is the force that pulls things toward earth. Water flows downhill because that is always the direction that gravity pulls it. Gravity pulls water downhill forcing it to flow past soil and rock. The soil and rock weathers as the water passes it because of the gravity.
  • Quick Review
  • Quick Review What do we call the breaking down of rock and soil over time?
  • Quick Review What do we call the breaking down of rock and soil over time? What are the 4 forces that cause weathering?