Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Objective: What is the ring of fire? Task: Journal Question What is a convection current? Follow the instructions for the mini-lab and answer the questions in your journal notebook. Modeling Convection Currents: Answer the questions in complete sentences. 1.What does the cold water in the plastic cup represent? 2.What does the red liquid represent? 3.What does the small cup represent? 3.Explain what happened. Include a drawing. 4.Would the same thing happen if the covered jar contained cold water instead of hot water? Explain. 5.Was your prediction correct? Explain why or why not. Modeling Convection Currents: The cold water represents the cooler part of the mantle. The red hot water represents magma. The small jar represents the Earth’s core. Explanation: Convection currents are driven by a difference in temperature and density. The hot red water rises to the cooler surface. The hot water is also less dense than the cold water. The cold water will not rise because there is no difference in temperature or density. What is the ring of fire? The ring of fire is a zone where major earthquake and volcanoes occur. Most of the active volcanoes on landmasses are located on the ring of fire. Many earthquakes also occur in this area. What is a volcano? Movement of magma inside Earth is called volcanism. A volcano is a volcanic mountain that forms when magma breaks through the crust. The opening from which the lava flows out of is called a vent. How are volcanoes classified? Volcanic eruptions can be classified as quiet or explosive. The three types of volcanoes are : – Shield cones – Cinder cones – Composite cones Composite Volcano It’s made of quite and explosive eruptions. Each eruption adds another layer of lava forming a volcano with a wide base and steep sides. Shield Volcano It’s made from quite eruptions. Layers of lava build up to form the cone. It has a wide base and the sides have gentle slopes. Cinder Cone It’s made from explosive eruptions. Dust, ash and rock particles are thrown out the vent. It has a narrow base and steep sides since the rocks roll down the sides. What are earthquakes? Earthquakes are strong movements of the Earth’s crust. A earthquakes occur when both sides of a fault are squeezed together. A fault is a break on the Earth’s crust in which movement occurs. Effects of earthquakes: Worktime: Materials: A large map, red and blue clay, a blue and red marker, map handout. Work in groups of 4. Each student will plot the coordinate points on the map for volcanoes (red) and earthquakes (blue). Copy the points onto your map hand out. Where do the volcanoes and earthquakes occur? Questions: Which tectonic plate has the most activity? In what kind of boundary do most earthquakes and volcanoes occur? Which boundary represents the midocean ridge? Explain how. Which boundary represents a trench? Which boundary is constructive? Explain. Which boundary is destructive? Explain. mid Atlantic Ridge