WE R O C K ( A Rock Study)
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A review of the three types of rocks complete with activities to model each of the types of rocks.
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WE R O C K ( A Rock Study)
- 1. WE ROCK! The Rock Review Presented by: Tanya Wall
- 2. The Objectives Old rocks on our Earth’s surface are gradually reduced to tiny pieces, or sediments, by erosion caused by water, wind, or glacial ice. Igneous rock is formed when molten rock (called magma) cools and solidifies. Sedimentary rocks start forming when soil and other materials on the Earth’s surface are eroded and finally settle down, forming one layer of sediments Metamorphic rocks are actually products of rocks that have undergone changes. Erosion breaks the rock down again, and the cycle continues.
- 3. Let’s Review and Show What We Know About Igneous, Sedimentary and Metamorphic Rocks
- 4. Igneous Rocks Igneous rocks are formed when melted rock cools and solidifies. Melted rock may come in the form of magma, when it is found underneath the Earth’s surface. It can also come in the form of lava, when it is released unto the Earth’s surface during a volcanic eruption.
- 7. Sedimentary Rock Sedimentary rocks start forming when soil and other materials on the Earth’s surface are eroded and finally settle down, forming one layer of sediments. As time passes, more and more materials get eroded and settle on the older layers. Thus, layer upon layer is formed. The lower layers undergo intense pressure due to the weight of the upper layers, eventually evolving into rocks.
- 9. Metamorphic Rock To morph means ‘ttoo cchhaannggee iinn ffoorrmm’. Metamorphic rocks are actually products of rocks that have undergone changes. So, a metamorphic rock may have once been an igneous, sedimentary, or even another metamorphic rock.
- 10. Give your rock a little heat and pressure!
Hinweis der Redaktion
- Rocks are all around us. You can see rocks inside your house, in your yard, on your street, on a country road, everywhere you look. Statues, chalk, marble, pencil lead, sandpaper, glass, tombstones, bricks, the walls of your room, mountains, pebbles, soil, and volcanoes are all rocks!! Rocks are used to build homes, an aluminum baseball bat, a washing machine, video games, airplanes, cars, and jewelry! Rocks aren't always solid. Sand and mud are rocks. No matter where you are you are always close to rocks and minerals. They are fascinating and exciting so let's begin our investigation to learn more
- Today we are going to have some fun with one of my favorite Earth topics…ROCKS. Let’s review how rocks are formed and how they change, continuing the rock cycle.
- What we have here are the three basic rock types. Igneous rocks, Sedimentary rocks and metamorphic rocks. And today we will talk a little bit more about each.
- Igneous rock is formed by cooling magma, and just like lava hardens as it cools, so does wax and chocolate!
- In order to demonstrate how this rock forms we have to first change a solid state to a liquid state like this chocolate bar. In order to do that we have to heat it up. And just like magma changes with intense heat and pressure, our chocolate can change forms as well. Now what we are going to do is to quickly demonstrate the cooling of that hot molten rock. Notice my candle volcano here as the wax cools, it hardens! Just like igneous rock! This is our chocolate, excuse me “our lava” as it cooled and hardened.
- Also, depending on how fast or how slow the lava cools determines if the grains are large as in granite or very fine as in basalt.
- If igneous rock forms deep below the earth’s surface, sedimentary rock forms just above the surface. Sedimentary rock is formed by the compaction and cementation of sediments. Sediments come from other rocks being weathered.
- Our model represented the formation of sedimentary rock. First we weather our graham crackers into tiny crumbs. We then added other types of sediment (sugar) and fossil fuels (butter) We will press our sediments in the pie pan and then place them into the oven to bake. Our rocks came out hard and tasty.
- Our final rock is the metamorphic rock. Let’s have a smashing good time with our metamorphic rocks. Remember, that we learned previously that metamorphic rock is formed by a rock undergoing massive heat and pressure. Remember that metamorphic rocks are not made from melting rock.
- So we will use our snickerzite rock and let’s really put the squeeze on it. Take some time to observe how your snickerzite rock changed, Really put the squeeze on your rock, put a book on our rock, stand on our rock and I even saw some sitting on our rocks. All it takes is a little heat and pressure to make a gooey metamorphic rock. Now let’s take time to observe the changes in our rock. Compare your metamorphic snickerzite to the new rock the goozite for changes in the structure and yes even the taste.
- Dr. Geo thanks the class.