Question

1) What's the inner part of the Earth made up of?
2) What are the layers of the inner earth?
3) What is the shape of the tectonic plates?
4) Are these plates floating on water?
5) How do these plates help in the creation of the landforms?
6) What are the effects of the tectonic movements?
7) What is subduction?



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Answer 1

1. The Earth is made out of many things. Deep inside Earth, near its center, lies Earth's core which is mostly made up of nickel and iron. Above the core is Earth's mantle, which is made up of rock containing silicon, iron, magnesium, aluminum, oxygen and other minerals.
2. They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core.
3. A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.
4. Tectonic plates float on the asthenosphere. The asthenosphere is immediately below the top layer of Earth's surface (lithosphere).
5. Volcanoes and ridges are landforms that are created by the movement of tectonic plates. Some volcanoes are formed when the plates pull apart under the ocean. A crack in Earth's crust forms. ... As the bottom plate is heated up by the Earth's hot mantle, a material called magma forms.
6. How the Earth's crust is split into large sections called tectonic plates is described. Their movement and effects at plate boundaries are explained e.g. earthquakes, volcanoes, mountain building, ocean ridges/trenches, subduction (part of the rock cycle).
7. Subduction zones are plate tectonic boundaries where two plates converge, and one plate is thrust beneath the other. This process results in geohazards, such as earthquakes and volcanoes. ... Earthquakes are caused by movement over an area of the plate interface called the seismogenic zone.

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