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Name: ________________________________ Convection Directions: Using the wonderful world of the internet, answer the following questions. Keep in mind the validity of the web site (.org and .gov are reputable than any .com site). What is convection? Why does convection happen? Where do we see convection on earth (Describe at least 2 observable examples)? Two video clips to watch and take notes on in your teams: - https://www.youtube.com/watch?v=ryrXAGY1dmE#t=11 - https://www.youtube.com/watch?v=QDqskltCixA Why do we believe convection is happening in the Earth’s mantle? If convection in the mantle is happening, how does it affect the plate boundaries? 1. Draw and describe how convection currents are moving in relation to both divergent and convergent boundaries. 2. What role does density play in plate boundaries and convection currents? 3. Do convection currents support Wegener’s theory of continental drift? Why or why not? Provide multiple reasons to support your position. Name: ________________________________ Colliding Continents You will be watching parts of Colliding Continents in your teams (the title is a hot link). Make certain to watch and discuss what it happening at each question. Begin at 14:40… 15:24 The surface of Earth is made of great jigsaws called ______________________ Why does the narrator refer to Earth’s surface as a jigsaw? 15:31 These jigsaw parts sit on what? ________________________ 15:55 What German scientist first proposed that continents move? _________________ What year did he propose this theory? ______________ 16:25 Describe how this German scientist used fossil records to help prove continental drift. 17:16 Plate tectonics is powered by what? ______________________ 17:30 Where does the heat generated in Earth’s core come from (name both)? 17:50 How does a lava lamp simulate the inner workings of the Earth? The bulb of the lava lamp would represent what part of the Earth? ______________ Which part of the Earth does the top of the lava lamp represent? _________________ Heat escaping from Earth’s _____________ creates _____________ currents in the Earth’s __________________ 18:20 What type of boundary is being described here? _________________ 18:49 Why does the magma cool when it contacts the water? As the magma slowly builds, it creates a vast volcanic mountain range. The narrator refers to one that is a 12,000 mile long mountain range called what? ________________________________________ How is it possible that vast mountain ranges form at divergent boundaries if the plate is separating? Compared to the mid-Atlantic Ridge (hint to answer on the previous page), what would the mountain range look like between the Pacific and Nazca plates? Between what two plates would there be the tallest ridge in the ocean? How can you tell? 19:47 How wide is this ridge in Iceland? _______________ 19:52 What two plates are separated by this ridge? 20:40 How fast are the two plates drifting apart? ____________________ 21:24 Today, the Earth has approximately this many plates? ____________________ How many of these plates would you consider to be major plates? ________________ How many of these plates would you consider to be minor plates? ________________ Describe the difference between how you classified minor and major plates? 21:40 How many miles does North America move every million years? ___________________ Jump ahead to 24:30… 25:20 How does the Earth maintain a constant surface area? 25:35 Watch closely at this plate collision. There is a transition from one type of plate boundary to another. What is the initial boundary type and then what does it become? Name two locations on Earth where we currently see this transition between these two different types of boundaries. Where will we see one of these types of transitions in the future? What two continents will eventually collide? Name: ________________________________ Define the following words: Uplifting Faulting Folding