1. 1. Igneous rock is formed from ________ and ______. 2. Metamorphic rock is formed from _____ and __________. 3. Sedimentary rocks form from _______ and __________. RAP:

2. Weathering 1.What is weathering? 2.What are the two energy sources that cause weathering? 3.What process can wear down whole mountain ranges? 4.What is mechanical (physical) weathering? 5.What are the agents of mechanical weathering?

3. 1. Weathering is the process of breaking down rocks and minerals into smaller pieces 2. The energy sources that cause weathering are the sun’s energy and the Earth’s internal forces

4. 3. Weathering can wear down entire mountain ranges.

5. 4. Physical or Mechanical weathering is the process of breaking rocks down into smaller pieces by physical force and not changing the composition

6. Agents of Mechanical Weathering Agents of mechanical weathering Abrasion-rocks grind against one another Wind-sand blows against rock Gravity-rock slide bump into each other rolling down a hill Biologic al Plants-roots grow in cracks and expand and break rock Animals- burrow in soil and move particles around Frost wedging- water expands and contracts Water seeps into cracks freezes expands and melts contracts