Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What is weathering?
   • Weathering is breaking up of rock where it stands.
2. Over time, what happens to rocks as they are weathered?
   • Rocks are broken down into increasing smaller Particles
3. What is chemical weathering?
   • Chemical weathering is the weathering of rocks caused by chemicals. For example, rainwater is naturally slightly acidic because carbon dioxide from the air dissolves in it. Minerals in rocks may react with the rainwater, causing the rock to be weathered.
4. What is physical weathering?
   • Physical weathering of rocks occurs when they are broken down, but the Particles that make them up are not chemically changed.
5. How are sedimentary rocks formed?
   • Sedimentary rocks are formed when sediment (little pieces of weathered rock) is laid down in layers under water and then compressed by layers above. The water between the sediment is squeezed out and the sediment bonds together.
6. What may occur when organisms fall into the sediment of a forming rock?
   • If organisms fall into the sediment then the rock can take the shape of the organism. These formations are fossils.
7. What causes the formation of a metamorphic rock?
   • Metamorphic rocks are formed when either igneous or sedimentary rocks are heated and under great pressure.