which type of rock was the first to exist on the planet?\na igneous\nb sedimentary\nc metamorphic
which type of rock was the first to exist on the planet?\na igneous\nb sedimentary\nc metamorphic
Answer
Brief Explanations:
Igneous rocks form from the cooling and solidification of magma or lava. When the Earth was young, it was a hot, molten mass. As it cooled, the first - formed rocks were igneous rocks. Sedimentary rocks form from the accumulation and compaction of sediments, and metamorphic rocks form from the alteration of pre - existing rocks under high pressure and temperature conditions. These processes require pre - existing rocks, so they could not be the first rocks on Earth.
Answer:
A. igneous