Warm-up: (Write your answer on the board please! Yes really!) 1. What exactly is a rock?

1. Warm-up: (Write your answer on the board please! Yes really!) 1. What exactly is a rock?

2. The Rock Cycle The Rock Cycle is the Earth system that depicts the interrelationships among the three general categories of rocks.

3. The Rock Cycle The sediment is eventually deposited in layers, which are compacted by the weight of the layers above. The process of cementation forms sedimentary rocks. This is called lithification. Over time heat from below and pressure from above can cause these sedimentary rocks to change form and change into metamorphic rock. If subjected to continuing heat and pressure, the metamorphic rocks can melt to become magma again and the cycle begins again. Molten magma in the upper mantle rises into the lithosphere, where it cools and crystallizes to form igneous rock. Over time, this igneous rock is weathered (eroded) by liquid water, ice and/or wind into sediment.

4. The Rock Cycle • The full cycle does not always take place due to “shortcuts” or interruptions. • Sedimentary rock melts • Sedimentary rock is weathered • Metamorphic rock weathers • Igneous rock is metamorphosed

5. The Rock Cycle

6. Warm-up: How can you tell what type of rock you are looking at? Think about how igneous rocks are formed. How would an igneous rock look different from a sedimentary or metamorphic rock? Think about how sedimentary rocks are formed. How would a sedimentary rock look different from an igneous or metamorphic rock? Think about how metamorphic rocks are formed. How would an metamorphic rock look different from a sedimentary or igneous rock?