Recommended: How plate tectonics changes earth structure
Rocks are heated underneath the crust then pushed out through a volcano or the oceanic plate. The rock substance that becomes the crust will deposit back underneath the crust. All of the process can be credited to the dynamic nature of Earth.
- Crust - cool, lightweight, brittle, which floats on top of mantle. It is the outer layer of earth. Tectonic processes reshape continents and also cause earthquakes - Tectonic plates- plates caused by convection currents in the mantle that causes earthquakes. - Ocean basins form where continents crack and pull apart. - Magma – is molten rock
The Connecticut river valley was also formed from many rifts and faults that had developed. A rift valley is a region of lowland that forms where tectonic plates move apart, which is how the river valley was formed. On the other hand, the plate tectonics also formed the Appalachian mountains. The Appalachian mountains were formed by convergent boundaries, which is when two plates collide. The
1. What is subduction and how did it plus faulting lead to the formation of Catalina’s island? Blueschist, greenschist, and amphibolite rocks are typically found in this order from top to bottom. Amphibolite is found at more intense pressures and temperatures than schists are found due to these metamorphic rocks being made from sediments that get subducted back down into the mantle. The unique Catalina Schist was formed when these layers of rock in the Farallon plate became subducted underneath the North American plate and eventually becoming “stuck.”
The asthenosphere is making convection currents. Since the convection currents are always moving it causes the asthenosphere to move and bend because it is ductile. When the asthenosphere moves which is under the tectonic plates it will cause an earthquake or more specifically the Alaskan Way
This volcanism has included such notable eruptions as Mount Mazama (Crater Lake) about 7,500 years ago, Mount Meager about 2,350 years ago, and Mount St. Helens in 1980. Major cities affected by a disturbance in this subduction zone would include Vancouver and Victoria, British Columbia; Seattle, Washington; and Portland, Oregon. The two tectonic plates involved in the subduction process at the convergent fault line are the Juan de Fuca plate and the North American plate. The Juan De Fuca plate being the denser oceanic plate is being subducted under the continental North American plate. Although the fault line is on the coast of the Northern American plate tectonic activity is also heavily present inland, evidence of this is the cascade volcanic arc formed by the tectonic movements at the fault
The volcano is created by a destructive plate boundary between the Juan de Fuca boundary and the North American plate boundary. This means it belongs to what is commonly known as the ring of fire.(1980 Cataclysmic Eruption) Both of these eruptions are by volcanoes caused by destructive plate boundaries. The main cause of eruption for both is due to an increase in subterranean pressure, however Mt. St. Helens was triggered by an earthquake.
#31 Zongpei Yang Introduction: Volcanoes come in different sizes and shapes. There is a different kind of volcanoes in the world in different areas for example the desert or just normal grasslands. What I think of volcanoes is lava flowing from a mountain or that’s what I think. The volcano that I am doing is named Mount Shasta the fifth tallest mountain in the world!
The Oceanic plate is pushed under the continental plate causing volcanos and the land to be pushed inward causing the land to rise forming mountains (United States). Glacier are made from snow that is then compressed over the years that it turns into ice, they can be formed on both
The steam explosive eruption of 1924 started on May 22, 1924. The eruption was named Halemaʻumaʻu. Most volcanoes erupt because when enough magma builds up in the magma chamber, it forces its way up to the surface and erupts which is how many volcanoes cause eruptions. The Kilauea 1924 eruption was caused when magma and molten rock drops into the water table and groundwater interacts with steaming hot rocks the steam builds up which starts eruptions. The tectonic plate that this volcano is on is the Pacific plate.
The Earth’s crust has several moving pieces. They are composed of a variety of igneous metamorphic and sedimentary rocks. The tectonic plates are always colliding or pulling apart, creating mountains. Earthquakes and volcanoes occur at the edge of these tectonic plates because of the impact of the plate movements are greatest there.
In this theory, the majority of the heavy moving was completed by the glaciers instead of humans. (Cohen ) ¨ The globe is dotted with giant rocks known as glacial erratics that were carried over long distances by moving ice floes.¨ (Cohen ) Furthermore, Dr. Brian John, an Archaeologist, had traced pieces of debris back to half a million years ago which would go along with the glacier movement.
Next over a long span of time the uplift, erosion, and glaciation of the rocks formed the landscape we see today. It all started when large amounts of sand and mud eroded from ancient
These two plates push and shove each other causing small tremors throughout which can cause landslides,volcanic eruptions and once in a couple years, quakes with devastating results. The strongest earthquake recorded occurred in 1991 with a measure of 7.6 on the Richter scale. This earthquake left 4 dead and buildings as well as bridges and road were completely destroyed. If another Earthquake occurs, the coastal cities would be the most affected ones as they are closer to the plates.
Earthquakes are caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two plates are rubbing against each other, they stick a little. Most earthquakes occur along the edge of the oceanic and continental plates. Due to stress they shift and cause the earthquake.
