Density and Structure of the Earth
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1 Density and Structure of the Earth Station 1 A marshmallow peep was placed in the microwave. The microwave was turned on high for 30 seconds. Below is the photographic evidence of what happened. 1. What happened to the mass of the marshmallow peep? 2. What happened to the volume of the marshmallow peep? 3. What happened to the density of the marshmallow peep?
2 Station 2 When you observe rocks in a stream or river, you often find they share common characteristics. The fast moving water moves rocks downstream. As the water slows down, the rocks begin to stop moving. Typically the largest rocks stop moving first while the smaller rocks continue moving until the water slows down even more. Below are pictures of six different-sized particles made of the same type of rock. 4. Which particles will fall to the bottom of a fast-moving stream first? 5. Which particles will be carried downstream the greatest distance? Imagine that all of these particles are carried from a fast-moving river into a lake. 6. Which particles will hit the lake bed (the bottom of the lake) first? 7. Where will most of the tiny grains be deposited?
3 Station 3 Have you ever walked along a beach and wondered why parts of it were sandy and other parts were rocky? When the waves hit the beach, the sand and rocks carried in the water fall out. The rock particles with greater mass are dropped first along the shore, while the sand particles with less mass are carried further up the beach. 8. The jar pictured to the right is filled with sediment from the beach. Which particles in the jar have the greatest mass? 9. If you want to walk barefoot along the beach, should you walk right at the water s edge or farther away from the water? Explain.
4 Station 4 Use a calculator to determine the density of each of these substances. Substance Mass (g) Volume (cm 3 ) Density (g/cm 3 ) 10. Gold g 10 cm Oxygen 1.33 g 100 cm Water 10.0 g 10 cm Paraffin 90.0 g 100 cm Mercury g 5 cm Copper 224 g 25 cm Which substance would sink to the bottom of a jar filled with water the fastest? 17. Which substance would float in the water? 18. Which substance would rise to the top of the jar?
5 Station 5 What s at the bottom of a stream or river can tell us a lot about how fast the water moves in the river. Slow moving rivers like the Mississippi are relatively flat, and the bottom of the river is covered with mud (silt) and sand. There are very few rocks because the water does not have enough energy to carry them along, and they soon get covered with silt and sand. Fast moving rivers have enough energy to carry small rocks downstream, and keep the sand and silt suspended (mixed) in the water as it flows downhill. The bottoms of steep, fast-moving rivers are covered with rocks, not sand. This biker is riding through a wash, where a stream once flowed. 19. Was this stream fast-flowing, slowflowing, or somewhere in between? 20. What evidence helps you decide?
6 Station 6 Raised Relief Globe Flat Surface Globe Look close-up photograph of the raised relief globe below. Each globe is an attempt to show the placement and size of continents in relationship to the entire Earth. When you look closely at the raised relief globe, you see an attempt to demonstrate differences in elevation. Mountains are shown as being raised well above the Earth's surface. While it is true that mountains are higher than the average surface of the Earth, the scale does not match the globe. At the scale of a globe, the entire surface would appear flat. At this scale, when compared with the enormous size of the entire earth, even Mt. Everest would appear flat! 21. In what way is the raised relief globe a better model than the flat surface globe? 22. In what way is the raised relief globe not a good model?
7 Station 7 When you look at a map, you observe relationships between parts of the Earth. Many maps are designed to allow you to place them on a wall. These large maps are very convenient models to use when observing the entire Earth at the same time. The major problem with maps as a model is that it distorts objects. The larger the area that is shown on a map, the more objects will be distorted. A map of the whole world will have much more distortion than a map of your city. Remember that the Earth is really round. When you flatten it out into a map form, it stretches out the poles and these areas appear larger than they really are. The farther away you get from the equator, the more the map is stretched. In the flat map above, Greenland appears to be about the same size as North America. It is, however, actually much smaller. 23. What is one advantage of using a flat map rather than a globe? 24. What is one disadvantage of using a flat map rather than a globe? 25. Which country is most distorted on the map above, India, France, or Finland?
8 Station 8 If someone told you to figure out what is inside the Earth, what would you do? How could you use evidence to figure out what is inside our planet? How did scientists figure it out? Geologists study earthquake waves to see Earth s interior. Waves of energy radiate out from an earthquake s focus. These waves are called seismic waves. Seismic waves travel at different speeds through different materials. They change speed when they go from one type of material to another. This causes them to bend. Some seismic waves do not travel through liquids or gases. They just stop. Scientists use information from seismic waves to understand what makes up the Earth s interior. Scientists also study meteorites to learn about Earth s interior. Meteorites formed in the early solar system and represent early solar system materials. Some meteorites are made of iron and nickel. They are thought to be very similar to Earth s core. An iron meteorite is the closest thing to a sample of the core that scientists can hold in their hands. Earth has a magnetic field, so there must be magnetic metals within the planet. Iron and nickel are both magnetic and very dense, so we think they are the main components of the core. We know that the mantle is made of molten rock because of lava that oozes out of volcanoes. In addition, scientists have calculated the overall mass and volume of the earth, and thus the density of the whole earth. The density of the whole earth is higher than the average density of the materials in the crust, so the inside of the earth must be more dense than the crust. 26. Give one piece of evidence from the information above that explains how we know that the outer core of the Earth is a liquid. 27. Give one piece of evidence from the information above that explains how we know that the density of the inner core is more dense than other layers of the earth. 28. Give one piece of evidence from the information above that explains how we know that the mantle is plasticized, molten rock.
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