Earth materials (origin of oldest rocks): The earliest rocks formed when molten magma from deep within the young Earth erupted and solidified. Name the rock type produced by the cooling and crystallization of magma (e.g., from volcanic eruptions). Choose the correct option.

Difficulty: Easy

Granite
Basalt
Igneous rocks
Sedimentary rocks

Correct Answer: Igneous rocks

Explanation:

Given data

Oldest rocks solidified from molten magma during early Earth history.

Concept/Approach
Rocks formed by the solidification of magma or lava are igneous rocks (e.g., basalt, granite are specific igneous types). Sedimentary rocks form from deposited fragments; metamorphic from transformation of pre-existing rocks.

Final Answer
Igneous rocks

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