metamorphic sedimentary igneous weathered
I gave my students this multiple choice question: In the Four Corners area in the US Southwest, there are large rocky outcroppings of basalt. These were formed by ancient lava flows. Using this information, what class of rock is this?

Only one answer is correct among these 4 choices:
- metamorphic
- sedimentary
- igneous
- weathered

Could you tell me which one is correct?

igneous