Simplify the following text for a Grade 10 native English-speaking person.
Original: Crystalline basement rocks , which are exposed in the higher central regions , are the rocks forming Mont Blanc , the Matterhorn , and high peaks in the Pennine Alps and Hohe Tauern .
Simplified: Even metamorphic basement rocks are found high on Mont Blanc , the Matterhorn , and other high peaks in the Pennine Alps and Hohe Tauern .