About 78% of the planet Earth is composed of ________ rocks. April 6, 2021 / By Preparation Point / MOD PAST PAPERS MCQs Share on WhatsApp Share on Facebook Share on Twitter Share on LinkedIn Igneous Sedimentary Metamorphic Stratigraphy Share this:TwitterFacebookMoreTelegramWhatsAppLike this:Like Loading... Related Share on WhatsApp Share on Facebook Share on Twitter Share on LinkedIn