lava
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Lava of relatively low viscosity (relatively low silica content, so basic rock such as basalt). Associated with constructive plate margins and with intra-plate volcanoes such as Hawaii.
Magma or lava. Classified as mafic or felsic, depending on it's minerology.
Lava is molten rock escaping through holes and cracks (eg volcanos) in the Earth's crust. The molten rock when under the Earth's crust is called magma.
Most likely an igneous rock can withstand molten lava.
Convection. E2020