Is all land on earth basically originally volcanic rock?
luka has the best answer here and I’ll expand on that a little. No is your answer. But if you had asked “igneous rock” rather than “volcanic rock” then you would get mostly a yes answer. Rocks are classed into 3 categories: igneous, metamorphic and sedimentary. A volcanic rock is a type of igneous rock, both are made from magma. Magma has to erupt at the surface for it to become a volcanic rock. The majoirty of igneous rocks solidify below the surface. Plutonic rocks (such as granites) are one example, but dykes and also sills are another. Origianally, in early earth, all rocks would have been igneous. There was a lot of kinetic energy around. Metamorphic rocks are rocks that are heated or put under pressure (or both) to change the chemistry of the grains. Metamorphic rocks can originate from igneous or sedimentary (or other metamorphic rocks) Sedimentry rocks are derived mainly from particles of other eroded rock. eg sandstone. The grains in sandstone must have either come from either
