Test #1 Study Guide Scientific Method, Plate Tectonics, Volcanoes Scientific Method What are the six steps of the scientific method? What is one thing that your hypothesis as to be? Why is the sixth step of the scientific method so important? What is an independent variable? What is a dependent variable? What is a control variable? How is it different from a control group? What are the four subdivisions of earth science? What are the definitions of each of these? What do they study? Plate Tectonics What were Wegner’s 3 pieces of evidence that continental drift was happening? What is another example of more modern evidence of continental drift that we now have? What is the name of the supercontinent that existed around 275 million years ago? Be able to name the 3 kinds of plate boundaries. What are some real-life examples of each kind of plate boundary? What are the layers of the earth? What is another name for the crust? What is ocean floor spreading? Where does the newest rock form? Where does the oldest rock get recycled? Volcanoes What are the three kinds of volcanos? Describe the shape and what kind of magma they have. What does silica content do to viscosity of magma? How does the amount of gas dissolved in magma affect volcanic eruptions? What is the ring of fire? Where is it located? What is the mid-Atlantic ridge? What were some of the warning signs before Mt. St. Helens erupted? What are the hazards associated with volcanos?