A horizontal intrusion of molten magma into the bedding plane of sedimentary rocks is called? by Sunday | Jun 15 | Geography WAEC | 0 comments A. phacolith B. lacolith C. sill D. batholith Correct Answer: Option C – sill Users Also Read These:The type of rocks formed from the molten magma is known as?An intrusion of molten magma formed horizontally…A plane inclined at 30o to the horizontal has an…Rocks which have been formed by the cooling and…A plane inclined at an angle at 30° to the…