Mira's Science Blogs

This is our model of the Three Sisters Mountains  Summary: The three sisters mountain in Oregon were created due to the movement of tectonic plates, called subduction zones. This movement created the mountains that we know today. The oldest mountain, known as the North Sister, or "Faith" is less than 170,000 years. This mountain is most eroded of the three and contains rock pinnacles and glaciers. The Middle Sister, or “Hope,” is a stratovolcano that is made up of basalt but has also erupted less common things such as andesite, dacite, and rhyodacite. The middle sisters has last erupted approximately 50,000 years ago and is considered extinct. The South Sister, also known as “Charity,” is the youngest and tallest out of the three. It is also a stratovolcano, and is about 50,000 years old, and has last erupted about 2000 years ago. These mountains are part of the cascade volcanic are which contains many volcanoes and ranges from western North America to southwest

https://upload.wikimedia.org/wikipedia/commons/5/5f/The-Three-Sisters-Szmurlo.jpg Summary: Do you ever wonder how some famous landforms such as mountains and islands are created? There are eight main tectonic plates on the surface of the Earth that make up the lithosphere. The movement of these plates is what causes landforms such as mountains and more. The three sisters mountains in Oregon were created by the movement of tectonic plates over a very long period of time. The three sisters mountains were created by the collision of subduction zones. Subduction zones are a type of convergent boundary where one of the places contains oceanic crust, and the other contains continental crust. The two plates collide, causing the oceanic crust to move downwards into the asthenosphere. The collision that created the three sisters mountains was between the Juan de Fuca tectonic plate and the North American tectonic plate. These amazing landforms were also created by land erosion. The

1. Islands can form from magma which is pushed up at a convergent plate boundary This is correct because, in subduction zones, the oceanic crust is pushed downwards, causing the magma to form islands. 2. Which boundary type adds to the lithosphere? (the hard outer crust of the Earth) The correct answer is divergent boundaries. In divergent boundaries, the plates move apart from each other, so the magma underneath fills in the gap and adds to the lithosphere. 6. The theory that says Earth's continents once made up an ancient supercontinent and have been drifting apart ever since is called the theory of Plate Tectonics. The correct answer is Plate Tectonics because "tectonics" means a long process that may affect the Earth's crust. This means that 'plate tectonics' is the theory that the Earth's continents have been drifting apart. 18. A fault is formed by the movement of a transform plate boundary The correct ans

https://tse2.mm.bing.net/th?id=OIP.vfbCde4pw2poO36x92C_HQHaFj Summary: Tectonic plates are the layer of the Earth called the lithosphere. There are eight main plates on the surface of the earth, and the movements of these plates cause earthquakes, mountains, volcanoes, and more. The tectonic plates are floating on top of the layer called the asthenosphere. The three main types of tectonic plate movement include divergent boundaries, convergent boundaries, and transformation boundaries.  In divergent boundaries, two plates are moving away from each other. When they pull apart from each other, the magma from the asthenosphere fills in the gap between the plates. Some of the effects of divergent boundaries include volcanoes. In transform boundaries, the plates move past each other, resulting in Earthquakes. An example of a transform boundary is the San Andreas fault. Convergent boundaries form when the two plates are colliding. If both of the plates in a convergent boundary

https://i.ytimg.com/vi/qFEBPD3JEOM/maxresdefault.jpg Summary The three main types of rocks are igneous, sedimentary, and metamorphic. These rocks are different and classified by how they look and how they are formed. The first type of rock is a sedimentary rock. Sedimentary rocks are formed from particles of sand, pebbles, shells and other small bits of material, called sediments. The sediments gradually create layers and eventually harden into rock.  Sedimentary rocks are pretty soft and may break apart easily. There are sediments visible in the rock, and this is the only rock that contains fossils. Some examples of sedimentary rocks are conglomerate and limestone. Igneous rocks are formed when magma cools and hardens inside of the Earth. The magma cools either inside of the Earth or erupts from volcanoes in the form of lava. The magma cools very quickly and  no crystals will form. This leaves the rock looking shiny and glass-like. Occasionally, when igneous rocks are cool