Simplify the following text for a Grade 8 native English-speaking person.
Original: Several transient features were observed , such as the `` whaleback , '' which comprised long shafts of solidified magma being extruded by the pressure of magma beneath .
Simplified: Several new features were seen , such as the `` whaleback , '' which is solid magma being pushed to the top of the volcano by magma under it .