Silicic is an adjective. It is used to describe Magma or Igneous rock. Magma or Igneous rock are rich in silica.Magma is a molten or semi-molten material from which all igneous rocks are derived. It is found beneath the surface of the earth in molten or semi-molten form. When it erupts from a volcano in the form of lava, it flows down, gets cooler and become solid as a rock.Silicic rock usually consists of 63 % of silica. Two common and famous silicic rocks are Granite and Rhyolite.So it is clear from the above given detail that Option a is correct option. Its location is likely underneath an ocean or a mountain. :D :)
