Answer: Option C
Answer: (c)
When molten materials of Earth’s interior (magma) do not reach Earth’s surface, they cool and solidify below the surface-are called intrusive igneous rocks.
e.g., granite, diorite, gabbro called Plutonic rocks have larger crystals, compact, resistant and glassy in appearance e.g., quartz, batholith. The rate of cooling is slower been formed at great depths.
Sills Some of the lava may push its way through passages in the form of sills or dykes. When magma is being forced upwards, some of the lava may push its way in between two layers of rock and get solidified there. The intrusive rock formed - called sill - almost horizontal.
Dykes Magma also forces its way before reaching the main fissure, trying to go up but gets solidified before reaching the surface. These intrusive rocks lying in a slanting direction as an offshoot are called dykes.