Fault-block mountains are formed when one plate pushes or pulls away from another plate. In the Earth, hot currents of magma or molten rock may well up and crack the weakened crust above. As the crust cracks, blocks of rock rise or fall forming Fault-block mountains. Examples of these mountains are the Sierra Nevada in California and the Grand Tetons in Wyoming. Dome mountains are formed by the same kind of molten rock that forms Volcanic mountains.
Gradually the seafloor spreads away from the center of the cracks and leads to plate tectonic movement. Convection currents are created by heat that rises from Earth’s core through cracks in the mantle. The currents are trapped in the lithosphere in the seafloor. As the heat builds up the mantle cracks and magma rises through the cracks and pushes plates apart resulting in the creation of new seafloor which then leads to seafloor spreading and plate tectonic movement. Convection currents can also be what cause volcanic activity.
A volcano I an opening in earth's crust, by molten rock and gas.Most of the Earth's volcanoes are located around the Pacific Ring of Fire because that the location of most of the Earth's subduction zones.When lava erupts it is made up of a slush of crystals, liquid, and bubbles. The liquid freezes to form volcanic glass. Chemically lava is made of the elements silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus, and titanium. There are 4 different types of volcanoes.There are Extinct, Dormant, Active and Mud volcanoes. The most popular volcano an Active Volcano.
The energy released from earthquakes and forces that move crustal plates are derived from the internal heat engine. Liquid water can exist on earth because the orbit is at the proper distance from the sun. The ozone layer is important to life on earth because it shields living things from uv rays. Constant change and state of flux on earth is caused by slow moving convection currents in the mantle. The internal heat of earth is a result of heat from radioactive decay of certain elements.
Although volcanoes are different in their own ways volcanoes are also horrific in their own ways . There are four different types of volcanoes these volcanoes include composite, cinder ,shield , and lava dome according to geography . Composite volcanoes are made of layers of ash and lava . When this volcano erupts there is a higher chance of having a pyroclastic flow rather than a lava flow . Lava domes are created by small masses of lava which is too thick to travel far .
Volcanoes obtain their energies from such movement and pressure. Volcanoes form at the boundaries of these plate where two types of movement occurs, two plates will collide with each other or the plates will move apart from each other. Some of these plates layers are cooled and are made up of rigid rocks. The affects on the landscape is lava that releases onto the Earth's surface. When that lava comes to the Earths surface, it is red hot and sometimes the temperature is more than 2012 degrees Fahrenheit.
Volcanoes class: class volcanoes common type of existence, which is formed in the center of the former types and its cones composed of rock debris material and lava flows directed by the volcano eruption, while restless. And the outcomes be coming out of the volcano eruptions during successive layers on each other, and some of them consisting of coarse material and another section of accurate materials, and between this and that interfere lava in a few strips of fish
Rock Fragments Rock fragment are usually called tephra and are formed from sticky magma. This magma is so sticky that its gas can not easily escape when the magma approaches the surface or central vent. Finally, the trapped gas builds up so much pressure that it blasts the magma into fragments. Tephra consists of volcanic dust, volcanic ash, and volcanic bombs, (from smallest to largest size particle). Volcanic dust consists of particles less than one one-hundredth inch in diameter.
Due to the existence of an immense temperature and concurrent pressure difference in the outer layer and inner layer of the earth, convection currents occur at the mantle. This energy results from overwhelming decomposition of radioactive substances contained by the rocks found at the interior of the earth. The developed convection currents lead to movement of lava; cold lava finds its way to the interior of the earth crust, while the molten lava which is generally hot, leaves the interior of the earth to the outside of the earth crust. These kinds of circulations occur at different locations of the earth surface and consequently results in segmentation of the earth due to movement in different directions. The concurrent convective circulations in the mantle leads to some segments of the mantle moving on top of the outer core which is very hot and molten in nature.
The descending in the subduction zone begins cold. As it descends heat increases because of the geothermal gradient and friction of subduction and heat lead to Fractional Melting . The initial melt may be mafic,but evolves through time to intermediate (Diorite/Andesite) and felsic (Plagiogranite/Rhyolite) rocks. Step 3- Generation of high P/high T ecolgite by descent of unmelted oceanic lithosphere which usually takes place above the subduction zone. The oceanic lithosphere which descend into the mantle has now been fractionated twice, once at the oceanic rift center, and now a second time along the subduction zone.