How do igneous rock form to sedimentary rocks?

Answer 1

Sedimentary rock can be changed into igneous rock by undergoing melting and then solidification. At a subduction zone (at a convergent plate boundary, where one plate slides beneath another), layers of sedimentary rock will be assimilated into the mantle. Some areas may undergo enough heating to actually melt, especially if there is water or carbon dioxide trapped in the rock. If this rock later makes it to the surface and cools, it will become an igneous rock. Another area where sedimentary rock could be changed into igneous rock is on the interior of a composite volcano -- The heat and force of the magma could break off chunks of volcanic welded tuff, causing it to melt. If the volcano then erupts, the former sedimentary rock would be incorporated into the lava and solidify into igneous rock.

Answer 2

When rocks (such as igneous rocks) undergo erosion, the rocks are broken down via chemical and physical weathering. These become sediments, like soil, or dust, etc. This sediment can then be solidified as a sedimentary rock.

Answer 3

It doesn't. Sedimentary rock forms over a long period of time as sediment settles on the bottom of a river or other waterway, and the pressure on top becomes great enough to form rock. Igneous (meaning "born of fire") rock comes from molten magma inside the earth. Volcanoes spew the magma out as lava. When it hardens, it is igneous rock. Metamorphic rock is sedimentary or igneous rock that has changed due to shifts in the earth's crust. When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change. Marble is an example of a sedimentary rock that has been changed into a metamorphic rock.

The only ways that sedimentary rock will form igneous rock are if the sedimentary rock shifts around enough that it is, basically, sucked into the molten core of the earth, or if you threw it into an active volcano. Either way it would have to come back out as lava and cool before it would be igneous rock.