Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'lava field'?

A. A the concept is an expanse of flat-lying lava flows. Such features are generally composed of highly fluid basalt lava, and can extend for tens or even hundreds of miles across the underlying terrain.
B. A tract of land which has few or no trees and is surrounded by more heavily wooded areas.
C. Area of a flood plane covered by the flood, but which does not experience a strong current.
D. A mesoscale eddy field is an expanse of marine water which includes coherent vortices, as well as a rich cascade of other structures such as filaments, squirts and spirals and is characterized by temperature and salinity anomalies with associated flow anomalies that are nearly in geostrophic balance. Although only the surface expression of mesoscale eddies is visible in satellite images of sea surface height or temperature, they are in fact three dimensional structures that reach down into the pycnocline.

Answer: A the concept is an expanse of flat-lying lava flows. Such features are generally composed of highly fluid basalt lava, and can extend for tens or even hundreds of miles across the underlying terrain.