Plate Tectonics Portfolio By: EXEMPLARY EXAMPLE

Table of Contents Plate Tectonicsslide 3-4 Seafloor Spreadingslide 3 Rift Valleyslide 4 Earthquakesslide 5-7 Tsunamislide 6 Geysersslide 7 Volcanoesslide 8-10 Convergent Boundariesslide 9 Types of Lavaslide 10 Resourcesslide 11

Plate Tectonics Seafloor Spreading Seafloor spreading is a continuous process that results in the formation of new rock at a mid-ocean ridges as older rock is pushed away. Harry Hess discovered mid- ocean ridges on the ocean floor. This discovery lead to the Theory of Seafloor Spreading.

Plate Tectonics Rift Valley Rift Valley is a topographical feature that is created at tectonic plate boundaries. Most rift valleys are a part of the mid-ocean ridge and are formed as the oceanic crust spreads or slides apart during tectonic activity. A rift valley is the location where magma from the mantle breaks through the ocean floor creating new rock.

Earthquake Tsunami A tsunamis is a massive wave that is the result of an underwater disturbance like an earthquake. Tsunami’s often form as a series of waves that grow in height as they reach the shoreline. The higher the wave the more the ocean depth decreases. The speed of a tsunami depends on ocean depth, not distance from source.

Earthquake Geysers A geyser is a vent in the Earth’s surface. Geysers eject a column of hot water and steam. Some geysers are small and others may blast thousands of gallons of boiling water from the ground. There are more geysers in the United States than anywhere on Earth. A famous geyser is Old Faithful at Yellowstone National Park.

Volcanoes A convergent boundary occurs where two tectonic plates collide. The denser of the two lithospheric plates will subduct and the less dense lithospheric plate will move over the subduction forming mountains. Convergent Boundaries

Volcanoes Types of Lava Molten rock is produced by a volcano. When it stops moving, it forms igneous rock. There are two main types of lava, pahoehoe (pa-hoy-hoy) and a'a (ah ah).

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