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

Which of the following definitions best describes 'aa'?

A. the concept is the lava structure typically formed when lava emerges from an underwater volcanic vent or subglacial volcano or a lava flow enters the ocean. However, the concept can also form when lava is erupted beneath thick glacial ice. The viscous lava gains a solid crust on contact with the water, and this crust cracks and oozes additional large blobs or ‘pillows’ as more lava emerges from the advancing flow. Since water covers the majority of Earth's surface and most volcanoes are situated near or under bodies of water, the concept is very common. [Wikipedia]
B. One of three basic types of flow lava. the concept is basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker. [Wikipedia]
C. Tephra is air-fall material (of any size) produced by a volcanic eruption regardless of composition or fragment size. [Wikipedia]
D. the concept, a type of quenched lava, is a silicic black volcanic glass [Wikipedia]

Answer: One of three basic types of flow lava. the concept is basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker. [Wikipedia]