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

Which of the following definitions best describes 'subglacial'?

A. A the concept is a violent explosion in the atmosphere of a star. Flares take place in the corona and chromosphere, heating plasma to tens of millions of kelvins and accelerating electrons, protons and heavier ions to near the speed of light. They produce electromagnetic radiation across the electromagnetic spectrum at all wavelengths from long-wave radio to the shortest wavelength gamma rays Most flares occur in active regions around sunspots, where intense magnetic fields emerge from the surface into the corona. Flares are powered by the sudden (timescales of minutes to tens of minutes) release of magnetic energy stored in the corona.
B. Depth hoares are large crystals occurring at the base of a snowpack that form due to the fact that a snow crystal can grow over time as moisture freezes onto the crystal from vapor that is rising in the snowpack.
C. Pertaining to the area in or at the bottom of, or immediately beneath, a glacier.
D. A fault whose two sides have approached each other substantially in the direction perpendicular to the fault.

Answer: Pertaining to the area in or at the bottom of, or immediately beneath, a glacier.