Final answer:
Lava that runs a long distance before cooling is called flood basalts, forming large, flat regions of rock.
Step-by-step explanation:
Lava that seeps out of a fissure and runs a long distance before cooling is called flood basalts. These large volume eruptions can cover vast areas with thick layers of lava. Unlike some eruptions that form cones or other distinctive shapes, flood basalts pour out of long cracks in the Earth's crust and spread out to create broad, flat regions of rock after they cool.
Examples include the Snake River basalts in the northwestern United States and the Deccan Plateau in India. These eruptions can produce extensive lava plains found both on Earth and on other terrestrial planets, like the Moon's maria, which are hardened basaltic lava flows.