Fine grained igneous rocks are formed when molten rock cool relatively quickly so large crystals are unable to form. This rapid cooling can only occur at the surface when lava erupted from volcanoes interacts with the air. Fined grained igneous rocks are called extrusive igneous rocks. Basalt and andesite are examples of such rocks. The diagram or image most likely shows volcanoes or lava flows.
The United States and Mexico depend on each other more than ever for our economic well-being and competitiveness. We will sink or swim together in the global economy.
