You will need to use the accompanying World ocean maps provided by your instructor, together with diagrams from your text and your lecture notes to answer the following questions concerning global tectonic processes. Diverging Plate Margins Mid ocean ridges . Converging plate margins . Volcanic arcs and trenches. Volcanic arcs are groups of active volcanoes located offshore of continents or on the continents, but near the edge which form a distinctly curved pattern that extends for hundreds of miles across the map.
Trenches often are associates with volcanic arcs.
Where they are present they form a long deep and narrow valley on the sea floor and are located on the seaward side of the volcanic arc. Transform Plate Margins . When two plates slide past one another the characteristic landform that results is a transform fault. These tend to be smaller landforms relative to other plate margin landforms. Locate the san Andreas fault on one of the world maps.