Question

1) What is a tectonic plate
2) explain how volcanoes are formed at convergent plate boundary
3) what is a plate margin
4) explain how volcanoes are formed at a divergent plate boundary

Answer 1

Answer:

1. 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
2. Subduction at convergent plate boundaries leads to melting and volcanoes. Convergent plate boundaries line the Pacific Ocean basin so that volcanic arcs line the region. Melting at divergent plate boundaries is due to release of pressure. At mid-ocean ridges seafloor is pulled apart and new seafloor is created
3. plate margin (plate boundary) The boundary of one of the plates that form the upper layer (the lithosphere) and together cover the surface of the Earth. Plate margins are characterized by a combination of tectonic and topographic features: oceanic ridges, Benioff zones, young fold mountains, and transform fault
4. Divergent boundaries also form volcanic islands, which occur when the plates move apart to produce gaps that molten lava rises to fill. Current research indicates that complex convection within the Earth's mantle allows material to rise to the base of the lithosphere beneath each divergent plate boundary

Explanation:

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Answer 2

A divergent boundary occurs when two tectonic plates move away from each other. ... A chain of volcanoes often forms parallel to convergent plate boundaries and powerful earthquakes are common along these boundaries. At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt.