These eruptions are characterized by:

* Large-scale outpourings of lava: The magma flows out of the crack in a wide, sheet-like manner, creating extensive lava flows.

* Low-viscosity lava: The magma tends to be very fluid, allowing it to flow easily over long distances.

* Formation of flood basalts: When fissure eruptions happen repeatedly over a long period, they can lead to the formation of vast, flat plains of basalt known as flood basalts.

Examples of fissure eruptions include:

* The Deccan Traps in India: These massive basalt flows, formed millions of years ago, are believed to have been caused by a series of fissure eruptions.

* The Columbia River Basalt Group in the US: This area is home to another extensive flood basalt region formed by fissure eruptions.

These eruptions can be incredibly powerful and are capable of significantly altering the landscape.