Tectonic plates are plates that float on the earths mantle. There are 8 major tectonic plates on the earth and at the joints of these many earthquakes seem to occur.
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There is no specific term "tectonic plantes". It seems like a misunderstanding. Tectonic plates are large sections of the Earth's outer shell that move around on the semi-fluid asthenosphere beneath them, resulting in phenomena like earthquakes and volcanic eruptions.
There are seven tectonic plates depicted in this setting.
The smallest plate tectonic entity is a microplate, which is a small fragment of the Earth's lithosphere that moves independently of major tectonic plates. These microplates are often found in regions where larger plates meet and can play a role in the tectonic processes of a region.
A tectonic plate could be described as a huge block of Earth's crust. For more information, please see the related link.
Eyjafjallajökull is located on the Mid-Atlantic Ridge, which is the boundary between the North American and Eurasian tectonic plates. So technically, it is on the divide between two tectonic plates.
The lithosphere is the layer that moves with the tectonic plates. The lithosphere is made up of the crust and the upper part of the mantle, and it is broken into tectonic plates that move and interact with each other.