The Relationships Between Plate Boundaries and Tectonic Landforms - ppt video online download
The Relationships Between Plate Boundaries and Tectonic Landforms .. one of the many elongated lakes that form part of the Great Rift Valley of East Africa. "Cenozoic dynamics of the African plate with emphasis on the Africa-Eurasia World map indicating tectonic plate boundaries. Plate tectonics describes the makeup and movement of the pieces of lithosphere on which Earth's continents and oceans ride. Where plates.
Ocean Trenches Ocean trenches form at two kinds of convergent plate boundaries: In both cases, the subduction forms an undersea trench.
The Relationships Between Plate Boundaries and Tectonic Landforms
These trenches are long, narrow valleys and include the deepest areas of the ocean. The deepest ocean trench is the Marianas Trench, reaching a depth of almost 36, feet below sea level. Sciencing Video Vault Island Arcs The subduction process that occurs when an oceanic plate converges with another oceanic plate can lead to volcanoes being formed paralleling the trench. The volcanic debris and lava build up on the ocean floor over millions of years and eventually results in a formerly submarine volcano rising above sea level to create an island.
A curved chain of these volcanoes, known as an island arc, usually occurs in these cases. The magma that forms these arcs derives from partial melting around the descending plate or the overlying oceanic lithosphere. Ocean Ridges At divergent boundaries, plates move away from each other, creating a new crust as magma is pushed up from the mantle. Mid-ocean ridges result from volcanic swelling and eruptions along the divergent boundary. Deep earthquakes are found along what kind of zones?!
The major volcano on the island snow-capped peak in the center of the photographShishaldin, rises approx ft m and has been active during the last years, with several eruption occuring recently.
The blue lake situated in a large volcanic caldera, which can be seen midway between Pogromni and Shishaldin volcanoes, is the result of a now extinct volcano that collapsed.
The Aleutian archipelago, formed by the collision of the Pacific Plate with the western extension of the North American Plate, forms a northern part of the Ring of Fire that encircles the Pacific Ocean. Unimak Island, the large island nearest the AK peninsula, is separated from the peninsula by Bechevin Bay, shown at the bottom of the photograph. Shishaldin Volcano is the westernmost and tallest of the three featured volcanoes. Isanolski Volcano is the middle volcano ft or m.
Which large landform in East Africa was created by the separation of tectonic plates? | Socratic
Why is this so?! See page 6 of your reference tables. Oceanic crust colliding with continental crust 24 We will be visiting the state of Washington in order to view plate tectonic features that resulted when the Juan de Fuca Plate oceanic crust collided with the North American Plate continental crust.
Based on the map to the right, and in the next slide, what features should we be looking for? Helens just to the top of the center of the imageand Mount Adams near the left center of the image in the Cascade Range of central and southern Washington, can be seen in this south-southwest-looking view.
The Cascade Range was formed from colliding tectonic plates N. America and Juan De Fuca and volcanic activity, and these forces continue to make the Cascades rise.
Mount Rainier at ft m is the highest point in the range. Forests cover an extensive area of the Cascade Range. The city of Portland, OR barely discernible and the Willamette River Valley are visible near the top left and top center of the image. Rainier, the tallest mountain in the Cascade Range at 14, ft mcan be seen in this low-oblique, west-southwest-looking photograph.
Mount Rainier, a stratovolcano that has been dormant sincehas 26 active glaciers. Scattered rectangular patterns are caused by the clearcutting practices of the timber companies in the region. Helens volcano with its developing lava dome and expansive pumice plain.
The grayish-colored area of the blast zone from the eruption extends outward to the northwest, north, and northeast of the volcano. North of the volcano lie three major lakes from east to west—Spirit Lake the largestthe elongated Coldwater Lake, and Castle Lake. Helens are clear-cut patterns lumbering interspersed throughout the darker green forested region of the Gifford Pinchot National Forest. Mount Saint Helens erupted on May 18,at 8: A series of moderate-to-severe earthquakes preceded the eruption, sending the north side of the mountain cascading down towards Spirit Lake.
The avalanche, the largest ever observed in the Western Hemisphere, weakened the magma chambers within the volcano, causing a northward lateral and vertical explosion that destroyed over square miles square kilometers of forest in 5 seconds, and sent a billowing cloud of ash and smoke 70, feet 21, m into the atmosphere.
Visible on this photograph and situated between the caldera of the volcano and Spirit Lake is a large, grayish, pumice plain. This plain is made up of volcanic mud, ash, and debris that burned the original Toutle River Valley to a depth of feet m.
The avalanche of debris and ash raised the level of Spirit Lake feet 61 m over its pre-eruption level, blocked the flow of Coldwater Creek, and formed the now elongated foot deep 91 m deep Coldwater Lake.
This lake is located approximately 7 miles 11 km from the volcano. Though not clearly visible on this photograph, vegetation has returned and is flourishing in most areas of the blast zone, with the exception of the pumice plain area. What plates are involved in this collision between oceanic and continental crust?
South America 31 Chile Southern Andes Mountains, Central Valley, Chile, Many volcanic peaks, snowcapped ridges, and glacial lakes of the southern Andes are visible in this southeast-looking view.