Rhyolite or Rhyolyte (Cant be exact on spelling but its the thought that counts)
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A Sill is formed
Firstly, it forms lava (liquid). When it hadens, it becomes a rock (solid).
An extrusion is an igneous rock layer formed when lava flows onto Earth's surface and hardens. Extrusions are always younger than the rocks below it.
rock and lava
Most likely an igneous rock can withstand molten lava.