Transcript Rock – N
Rock – N - Roll Earth Review What happens when water gets into cracks and freezes? The water expands and it freezes and causes the crack to get larger, possibly breaking the rock. Which of the following is an example of weathering? • Wind blowing sand along the beach • Waves carrying sand to and from the beach • Plants growing in cracks of a sidewalk and making the cracks larger • Colorado River carrying rocks from one part of the Grand Canyon to another What happens to rocks in the waterflowing washesover Therivers waterasconstantly them moves smaller theover rocks and and the movement pieces of rock along against other rocks and through surfaces the river. Discuss this in your makes the rocks smooth. group. Which of the following would have the most effect on weathering something? What helps prevent erosion? 2 1 wind Planting trees/plants/crops 3 4 Running water Paving roads Slow vs. Fast Processes 1 weathering/ 2 Erosion/deposition 4 3 tsunami Glacial erosion Weathering and Erosion • Weathering The forces of nature take control! • Erosion Nothing lasts forever! Mrs. Hoy hit a sample of galena with a hammer. She says, “Notice how the galena breaks and both sides where it broke are smooth and flat.” What property does this represent? Rachel picks up a mineral and pulls it across a glass plate to see if it scratches the glass or not. What physical property of the mineral is she testing? Tristan turns to his partner and says, “This mineral looks like glass, it is very shiny.” What physical property of the mineral is he noticing? Discuss with your group what you are testing when you look at the hardness of a mineral. You are testing how hard or soft a mineral is. The harder it is, the more difficult it is too scratch. What are the three types of rocks? BrainPop – Types of Rocks I am… • A rock that forms when melted rock cools and hardens • If I cool quickly, I form small crystals. • If I cool slowly I form large crystals. • Granite and Basalt are examples of me I am… • Rocks t hat form when layers of minerals and rock particles harden into solid rock. • Most fossils are found in me. I am… • Formed when other rocks are changed by hear and pressure. • The mineral crystals can change in size or shape. • Slate and quartzite are some examples of me. Are all rocks the same? • Igneous, Metamorphic, and Sedimentary Rocks are maderocks up all have different of minerals. characteristics. Minerals are the What blocks is the same building of about all rocks? rocks. Mr. Parr’s Types of Rocks Mr. Parr’s Rock Cycle How do scientists decide if a rock is metamorphic, igneous, or sedimentary? They look at how it was formed. • Deposit these gems of knowledge for your test tomorrow. • These bits of information should not be weathered or eroded by TV.