* Lava: Molten rock that erupts from volcanoes.
* Plateau: A large, elevated area of relatively flat land.
How they form:
Lava plateaus form when a series of basaltic lava flows (typically very fluid) erupt from fissures in the Earth's crust. These flows spread out over vast distances, covering existing landscapes and creating a flat, expansive surface.
Characteristics:
* Extensive and flat: Lava plateaus can be hundreds or even thousands of square kilometers in size.
* Basaltic composition: The lava that forms them is typically basaltic, which is rich in iron and magnesium and tends to be very fluid.
* Columnar jointing: Often, the cooling lava forms distinctive columnar joints – hexagonal or polygonal columns that resemble stacks of rocks.
* Examples: The Columbia Plateau in the United States, the Deccan Traps in India, and the Ethiopian Plateau are all notable examples of lava plateaus.
Significance:
Lava plateaus are significant geological features that can:
* Influence local climates: Their elevation and expansive nature can create unique microclimates.
* Support diverse ecosystems: They provide habitats for a variety of plants and animals.
* Provide valuable resources: They can contain valuable minerals and geothermal energy sources.
* Offer insights into Earth's history: Studying their formation helps us understand past volcanic activity and the evolution of the Earth's surface.
